If my neighbors all decided we can blow up the next block over for reasons, it definitely makes it very cool and very legal for me to help.

My entire point is that it is not. In your example the Democrats want to blow up the next block over and the Republicans want to beat everyone out of their houses. Both are wrong. The murder is still worse.

Saying that voting for the ones who want to blow things up is somehow justifiable is exactly what you are joking about. You cannot legitimize helping your neighbors who want to blow up the next block over by voting them onto the neighborhood council. But you cannot do the same either for the one who want to beat people up instead of blowing them up.

The only ethical choice was a third party vote and if the majority of people in the US had ethics, they would have done so. As you said yourself, other people voting for genocide or ethnical cleansing does not justify you doing it yousrelf.