The study results you're talking about seems to be consistent with other studies I've read about. But, the wealthy, educated, leftist whites are a small minority compared with the entire left. They're just really loud and have a really huge platform in media. They also use strong arm tactics to mobshame dissenters on the left into silence.
So do you have any evidence of widespread friends and family becoming enemies? I have some pretty progressive family. Prolly not going to get them to change their minds on gun control. But they understand that being a 2A supporter, I'm not their enemy. We can disagree. They get their vote just like we get ours. As long as the process is fair, and both sides are represented honestly. And that's one area where I've made some headway with family. The process is not fair. It's very biased against the 2A. I've shown them what the anti-gun side claims, vs the actual reality. They've admitted it was dishonest. Point is, that's not how enemies interact with each other. My progressive in-laws are not my enemies either.
Because the fringe left has control of the entire left, THAT'S the danger. There seems to be some evidence that moderate left people are starting to move to the right, because they see the bat**** craziness. So it would inaccurate to call those "enemies".
I will accord them non-combatant status when they stop acting like my enemy