This question is frequently asked, and the range of answers is always wide. It really comes down to a question of context. Do you really want to follow the Buddha’s heartfelt intent, or cling to an exception he granted to monks who begged for their food thousands of years ago, rather than buying it in a modern supermarket as is done today. Here are some relevant quotes so that you can decide what compassion means:
The reason for practicing dhyana and seeking to attain Samadhi is to
escape from the suffering of life, but in seeking to escape from
suffering ourselves, why should we inflict it upon others? Unless you
can so control your minds that even the thought of brutal unkindness
and killing is abhorrent, you will never be able to escape from the
bondage of the world's life. No matter how keen you may be mentally,
no matter how much you may be able to practice dhyana, no matter to
how high a degree of Samadhi you may attain, unless you have wholly
annihilated all tendency to unkindness toward others, you will
ultimately fall into the realms of existence where the evil ghosts
dwell. You of this great assembly ought to appreciate that those human
beings who might become enlightened and attain Samadhi, because of
eating meat, can only hope to attain the rank of a great Raksha and
until the end of their enjoyment of it, must sink into the never
ceasing round of deaths and rebirths. (Surangama Sutra: Importance of
Keeping the Precepts)
The Buddha said, “Son of my lineage, my teaching is not like that of
the naked ascetics. I, the Tathagata, established rules of discipline
in relation to specific individuals. Consequently, with a certain
purpose in mind, I did give permission to eat meat regarded as
suitable for consumption after it has been subjected to threefold
examination. In other contexts, I have proscribed ten kinds of meat.
And yet again, with someone else in mind, I have declared that it is
improper to consume meat of any kind, even of animals that have died
of natural causes. But I have affirmed, O Kashyapa, that henceforth,
all those who are close to me should abstain from meat.
(Mahaparinirvana Sutra: Abstaining From Eating Meat and Fish, Even
Died by Natural Causes)
Unfortunately, there are many who will try to persuade you to think that eating meat is ok, as long as you don’t kill the sentient being yourself. The Buddha foresaw this:
After my Parinirvana in the last kalpa these different kinds of ghosts
will be encountered everywhere deceiving people and teaching them that
they can eat meat and still attain enlightenment. But how can any
faithful follower of the Lord Tathagata kill sentient life and eat the
flesh? (Surangama Sutra, Ibid)
The root tantra of Kalachakra says: Wicked people, hard to train, kill
harmless beasts as sacrifice to gods and for their ancestors, to gain
protection, profit, and fulfil their aims. To buy the meat, to wish to
eat it, is indeed an evil act.
The Buddha was quite clear that he taught compassion, not evasion of responsibility:
For innumerable reasons, Mahamati, the Bodhisattva, whose nature is
compassion, is not to eat any animal flesh. I will explain the
reasons: Mahamati, in the long course of transmigration, all sentient
beings have been our brothers, sisters, mothers, fathers, sons, and
daughters, and we have felt many different kinds and degrees of
kinship with each and every one of them. These sentient beings have
been beasts, domestic animals, birds, and humans in different
lifetimes and have often been related to us in some way. This being
the case, how can the Bodhisattva-Mahasattva who desires to respect
all sentient beings as he or she would respect himself or herself and
who is committed to devotedly practising the Dharma eat the flesh of
any sentient being whose nature is the same as himself or herself?
Even, Mahamati, the Rakashasa, when they listened to a discourse on
the highest essence of the Dharma by the Tathagata, were inspired to
protect Buddhism. Through this they had awakened to the feeling of
compassion, became sensitive to the sorrows of sentient beings, and
therefore chose to refrain from eating animal flesh. How much more
should human beings who love the Dharma do the same! Thus, Mahamati,
whenever and wherever there is evolution among sentient beings, let
people cherish the thought of kinship with them, and holding the
thorough intention of treating them as if they were our only child,
and therefore refrain from eating their flesh. So much more should
Bodhisattvas, who are committed to being compassionate towards all
sentient beings, and whose inner nature is compassion itself, choose
to refrain from eating animal flesh. For a Bodhisattva to keep good
integrity with the Dharma, he or she should not make any exceptions to
the eating of animal flesh. He or she is not to eat the flesh of dogs,
donkeys, buffaloes, horses, bulls, humans, or any other sentient being
whether or not such flesh in generally eaten by some humans in some
culture or society. Nor should a Bodhisattva eat flesh sold by others
for monetary profit.” (A Re-translation of the Eighth Chapter of the
Lankavatara Sutra and Commentary, By William Bagley, 2006)
Pure and earnest bhikshus, if they are true and sincere, will never
wear clothing made of silk, nor wear boots made of leather because it
involves the taking of life. Neither will they indulge in eating milk
or cheese because thereby they are depriving the young animals of that
which rightly belongs to them. It is only such true and sincere
bhikshus who have repaid their karmic debts of previous lives, who
will attain true emancipation, and who will no more be bound to wander
to this triple world. To wear anything, or partake of anything for
self-comfort, deceiving one's self as to the suffering it causes
others or other sentient life, is to set up an affinity with that
lower life which will draw them toward it. So all bhikshus must be
very careful to live in all sincerity, refraining from even the
appearance of unkindness to other life. It is such true hearted
bhikshus who will attain a true emancipation. Even in one's speech and
especially in one's teaching, one must practice kindness for no
teaching that is unkind can be the true teaching of Buddha. Unkindness
is the murderer of the life of Wisdom. (Surangama Sutra, Ibid)
Whoever, having laid aside violence in respect of all beings, moving
or still, does not kill or cause to kill, him I call a brahman.
(Sutta-Nipata III.9:629)
These are just a representative example of quotes. There are many more. There are also reinterpretations of the Buddha’s teachings that stray from his heartfelt-intent. In those cases, ask yourself if he meant selective compassion, or compassion for all sentient beings. And follow your heart—don’t listen to others.