I think it tends be a generational thing. It seems like a natural progression, depending on your personal identity. My grandparents would say that it was terrible in the 1930s, and even the 1960s, which I guess it was... for them.For example, every Christian I know believes they're living in "The End Times." The same seems to hold true for people and their perspective on American culture, in general. It may be possible that that's our purpose, to continue to feel divided, at least in some way. I dunno.
For me, personally, it's been my experience of awareness of things going on outside of my own personal space/bubble. When I was 22, I didn't give a shit about anyone else at all, really. Same could probably be said when I was 32. I think, by 42, it had begun to change. Maybe it was my exposure to American politics, or my CHOICE to pay more attention. Maybe that was a bad choice. Again... I dunno. I am more aware of what others are experiencing.
And, when you said "up until the recent riots"... well, doesn't that count??? I mean, shit! It was going on in 1992 and we're right back where we were then. I had other priorities in 1992, I guess. This is where I am now. If you're able to remain insulated and removed from it, and it doesn't concern you at all, that's great for you, I suppose. It's definitely great if that was your objective, right? (rhetorical)
Sorry to make you wait and keep posting for my answer.