"Evil" is a term that really only belongs to theology. The thing about evil is that evil (and the kind of good that goes with evil) is that they're absolute. Things are good or evil "by nature" - from no particular perspective. That's nonsense. We recognize that some things are good or bad (bad, not "evil") from our perspective, but that the bourgeoisie have an opposed view. What they do is literally good from their perspective. We can't, therefore, convince the bourgeoisie to give up power with moralistic arguments (because from their perspective they are right), it's impossible. We have to actually overthrow them. Recognizing the necessity of the violent overthrow of the current order the, IMO, the fundamental belief of Marxism.
Basically, good and bad = good and bad for something, some person, some group, etc. Good and evil = supposedly good and bad per se. But that's nonsense, and only a cloak that the ruling class uses to present what is good for them as good per se.