I totally agree that the division and tribalism on US politics is terrible. The threats, disrespect and alienation between both sides are not okay, and both sides are guilty of that. It's the fruits of the toxic and hostile political culture in the US, and it's gotten continuously worse over the past 20 years. I don't think there was this kind of hostility in the 1980s (though I admit I'm too young to be sure about that).