I agree with everything you said. But I'd suggest that not only are the debates in academia alive, they're actually too vigorous and too radical.
I think one of the contributors to the current political situation is the increasing influence of academia on politics and the law. Instead of having a few big ideas that we wrestle with, every politician and lawyer is a little Leninist bent on burning everything down in favor of their ever-changing pet political philosophies. And the notion of moderation has somehow become radicalized, I think; a dirty word for some people and a rallying cry for others.
The vigorous creativity of scholarship provides an endless supply of fodder in terms of new ideas, new reasoning, new justifications, and most recently new "facts". If we were a nation of philosophers it'd be some kind of paradise. But we're not, and it's ripping apart our core social institutions.
I'm not dissing the scholarship, or trying to suggest it's all bunk. I mean, even bunk can be valuable by challenging assumptions or by making conspicuous assumptions itself. But too much of that debate is bleeding out into the culture. A whole new layer of public policy institutions and media outlets feeds off and disseminates the half-baked ideas. There's never any time or energy to winnow the chaff. And so it's effectively poisoning the social and political culture.