Thank you for that. I used to read Crooked Timber pretty regularly, years ago. In fact, I had one of the sometime contributors for a semester as a philosophy professor (back in the last century).
I agree Haidt's model is flawed, especially on the idea of sacredness being something liberals aren't concerned with. I think he's onto something, but he's painted with too broad a brush.
Lately, I've been reading a lot on the subject of religion: specifically, from an anthropological or sociological perspective. I'm interested in the idea of ersatz religions—filling the void left by modernity's secularism. My suspicion is that the great bulk of people cannot do without the things that religion affords; and so if they aren't "religious" in the traditional sense, they unwittingly find some substitute that does everything but revere Christ, YHWH, Allah, etc.
Behavior that fits that model I see again and again, on what we think of as the political left.
https://crookedtimber.org/2017/01/22/protestandpolarization/