In Buddhism the two beings that are often confused with the Christian concept of the devil, Yama and Mara, are also Bodhisattvas. Lord Yama’s job is to make sure beings receive the appropriate karmic retribution in the appropriate hell realm.
Which strikes me as completely antithetical to Buddhism, the Dharma, the Bodhisattva way of life, and well in just about every sense wrong and even dangerous idea about how karma works. This is certainly never been taught to me in the Gelug tradition of Tibetan Buddhism and I would be quite shocked if any of my teachers (in the lineage of His Holiness the Dalai Lama) accepted any of this.
As a student of Tibetan Buddhism, but not specifically the Vajrayana I would like to know if there is any defense of this from the viewpoint of Vajrayana? Does anyone follow this way of thinking?
Personally, I would file this under don't believe everything you read purporting to be Buddha Dharma on the internet. There are ignorant people out there making all kinds of bellicose claims and surrounding themselves in the iconography and material trappings of Tibetan Buddhist culture all the while being shockingly ignorant of Buddha Dharma. This seems to me to be one of them.