In-Universe Evil
Spawned by the battle between three basic ass bricks.
I'm under the feeling that a lot of almost-genocidal stuff happens in comics regularly and that Marvel/DC clearly opérate in a higher level of evil than Reality does. To check my hypothesis I'd like you to chime in with scans about big evil plots that would've been ludicrously evil in real life (disregarding whether they were thwarted or not)
Some ground rules:
1) We'll focus not in personal evil (how twisted, crazy or cruel a character is) but in the consequences it has on society or populations as a whole. Cruelty boasts evilness of big already bad actions, but it's not enough to make it qualify.
2) Let's ignore showings that got magically reverted back by some plot device, if only for the "what ifness" of those effects.
3) Stick with mainstream Marvel/DC or characters that are recurring in the main universe even if they come from somewhere else.
4) Interspecies violence might count as long as races are intelligent (it's kind of a cop out, but let's stick to it)
My first example is obviously Kang, who through his conquests has a death count ranking in the Billions.