Encouraging others to demeritious deeds (a-ku-sala) is one of the four ways of evil kamma (aside of bodily doing, by approve, rejoicing, by speech). Praising what deserves dispraise, leads as well toward low realms hell. Like the sharing of merits (kusala), telling of good conducts and let others rejoice with it, share of demerits has same effects like sharing merits, for one who shares, and those who join by approve and delight but into downwardly direction with painful results. Those who share disaprove of what deserves praise, like tjose who join this demerits head as well toward hell.
Like a single candle can light countless others, such is the possibility of offering a share of A-Dhamma and can be used to burn off much. Everybody knowns the phenomena of demerits, known as root of wars and disasters and everybody has seen samples of joining demerits.
Medias are full of shares of demerits and looking at upvotes and likes shows as well how strong and rich the part-taking on demerits arises. People still wonder why humans, at large, meet low realms after break up of the body... Yet who knows of places where share of merits is custom and finds approve? Most of you might not even have ever met such places, yet so deep in the forest that trees all around are not seen, in regard of share and rejoice with demerits... just look at this occasion right here... "buddhism exchange, they call it..." Sad but true.
As today tools of shares are much faster, one is wise to better do not spread of what one isn't sure whether right or wrong, good or bad.
Blindness and lack of discerment aren't a protection of results, note that not-knowing, not-understanding is the root of suffering and who would do anything wrong if knowing, at least.
Many might think that things are easier this days, but actually much more dangerous for not so gifted and discerment and good association-lacking common people.
And in regard of an Unfettered Heart: Such has gone beyond merits and demerits by own deeds, beyond accumulation, yet, out of compassion, still shares samples of both to teach it's distinction, teaches benefits (for long term happines) of merits, teaches loose by demerits, and both and in cases all does not work out, he 'kills' ones in regard of getting approached and shares further on.
May merits and demerits, right discerned, been always seen by those who ever little capable, forwarded and take part or not on them.
Take care and as a khema proverb tells: turn your tongue better 100 times aronnd before speaking.