You can't, and you don't have to. It's their problem and their responsibility. They have the right to do whatever they want within their sovereign territory, for better or for worse.
You are right. It is reasonable to try to do good within your immediate social circle.
You can still feel bad for situation that afflicts others AND could very well end up being part of culture in US.
Is that not worth contemplating and worth feeling bad about; if only for a little while?