I think the thing to understand is that university professors are upper middle class.

They are not particularly aligned with the working class or with leftism. They're usually centrists or liberals.

I think your confusions stems from believing that liberals are the left. Liberals however, are pro-free trade ultra-propertarians. Liberals are to the right of anti-free trade populists.

Your “no true Scotsman” argument is tedious and irritating. Please stop annoying me with it.