Humanity has the capacity of cruelness and darkness, yes. But it has the capacity for good and helping as well. No one is saying that it isn't messed up that money can save people who should be punished, but that doesn't change the fact that you do in fact become what you're fighting against if you decide to take justice into your own hands. There's a reason people keep saying that and it has nothing to do with lies or whatever you want to believe. Especially here. We see it and experience it, real life, the dreams. It does happen and to say it doesn't is wilful ignorance.
No. But you have no problem using the Force to attack someone who couldn't fight back all because they disagreed with you and you didn't like what they had to say. Yeah, that doesn't sound like wanting to wipe people out who aren't like you or harm them at all.