> What about North Korea and Russia?
What about them? We are not the only country on the plant. Let those they harm oppose them.
> What about Rwanda, apartheid, the holocaust? If we are capable and have the ability to intervene why shouldn't we?
All those things are in the past, not the present. We caused none of those. We are responsible for none of those. We are not the world police.
We should oppose those who are against our strategic interests. There are many other countries on the planet that can handle things if we step back. As for why "If we are capable and have the ability to intervene why shouldn't we?" the answer is - we are not responsible for the planet. Every time we intervene, people hate us. Most of the planet is hostile to us precisely because we have been intervening all over like a giant fat drunk monster. It needs to stop.