This is always such a tricky subject when you get into the thick of it because their are different points of view depending on the context of the teaching. Our common understanding is the law of karma, that we are encouraged to abandon killing. Then there is the story of Buddha Shakyamuni in a previous life (when he was a Bodhisattva) as the captain of a merchant ship where he saw with his clairvoyance that one merchant was going to kill all the others so he killed this merchant. #11 of the Secondary Downfalls of the Bodhisattva vows is 'Not believing that Bodhisattvas' compassion ensures that all their actions are pure', and ultimately we do not know the midstream of others, so, it's a little complicated. It is not commonly known to the public that Bodhisattvas and Buddhas do whatever is necessary even if it involves killing, and for good reason. But it is the truth. The skillful means of holy beings is beyond the comprehension of ordinary beings!!
In Lama Chopa it says: "I seek your blessings to make this freedom and endowment extremely meaningful, by immediately applying meditation to whatever I meet..." Therefore, most important thing for each of us individually is to decide what Dharma view to apply at each particular moment. There is no such thing as inherently existent good or bad, hero or murderer. That's the beauty of it. We are free to view the appearance in whatever way is going to effect our mind in the most beneficial way. This thread about Mr.Drum teaches many things: karma, impermanence, the disadvantages of murder and sexual misconduct, loss, having to encounter what we don't like, or maybe it's a Bodhisattva or Buddha engaged in wrathful actions because it was more beneficial for their spiritual journey to lose their life and purify huge negative karma now so they would have the opportunity to practice in the future without such obstacles. We don't know for sure, so better to develop a Dharma perspective and meditate on it so that the appearance stimulates profound realization in us, for that is the only reason it is appearing anyways!
Use the appearance to gain realization, not to judge or try to box an appearance into some inherently existent fixed right/wrong. To a Buddha, Drum is a Daka of the Heruka body mandala. Is that perception wrong?