It's not innate...
Innately humans are just animals. It takes effort to get people on the same page that cooperating is usually best
But we stopped teaching kids that in school 20 years ago.
That's the sad truth about it. It's not that the right corrupted a generation, just that between them an the neoliberals, no one wanted to help them. They both wanted brain dead tribalism because that's what their mutual donors want
It honestly shouldn't be that hard for everyone to follow the string back to "no child left behind' but I remember pointing out this would happen 30 years ago, and I thought it was obvious back then too.