"Why are many American Christians cruel?"
Fair question.
First, the internet amplifies anger, and many loud angry "Christians" are bots or inauthentic accounts. So there's that.
Second, I think most are great, but you just don't hear from them as much here.
Third, when we're talking about real Christian humans who are jerks, I find it often stems from insecurity. They've sunk a lot into their faith, but they:
1) Struggle with doubt (which is natural and okay).
2) Believe that consensus is what makes something true (which is false and not what the Bible teaches).
3) Are afraid that if consensus moves too far away from Christianity, then maybe Christianity isn't true.
4) Haven't identified that this is what they're going through, so that turmoil and wrongly-structured faith manifests in anger, and sometimes metastasizes into bitterness.
There are other reasons we can act like jerks, but maybe that's one version of how we can get twisted up and turn mean that's a little bit humanizing at least. I think people from other ideologies can experience that cycle as well.
Of course, I know tons and tons of Christians from all different traditions who are full of love, joy, and kindness even in bad circumstances. They have a peace that doesn't make sense relative to what's happening around them. You don't hear from those kinds of Christians as much on the Internet.
Anybody have any thoughts on why many American "Christians" are some of the cruelest people out there? What's the psychology there?