Sorry, I don't have time for an in depth read and reply. I agree in part with some of your criticisms, and I do think the liberal philosophy has given us great gains but is in a stage of ä bit too much".
However, the argument is probably a bit more nuanced than ALL liberals want this extremism. I would think that I would identify myself as liberal leaning, but I disagree with excesses of the extreme.
When I get back, I will try to post a proper answer.