problems with core philosophy

I'm having increasing problems with nonviolence. It's important to me, and has been for a long time, but I think it's because it feels like I have to believe in it. Looking at the world is a bleak undertaking, and it's hard to miss the fact that some are much more villainous than others (or, on a larger scale, some incur much more ecological damage than others). It's getting harder to avoid the pitfall of thinking that an immense amount of humanity will die in my lifetime because we're too selfish and stupid to change, and if that's so, an increasingly loud part of me keeps saying, "I want the rich fuckers to die first."

I don't (fully) trust my perspective. I think this is one place where overintellectualization may help me; I keep looking for more information rather than acting on what I already know. Well, maybe that plus advanced stage bleeding heart empathy. But I think maybe my traditional stance of nonviolence might be hollow, might be a decision taken out of necessity rather than a deeply held belief, and that worries me.