Leftist academics are very active. It's the SV nerds, the rationalists, the libertarians, centrists, marginally right-wingers who are very passive. They can't organize, can't use their wealth, can't influence culture for sht. Also, many of them fear the left/loss of profits.
The only thing they can agree on and actually coordinate on is that fighting off leftist aggression into their space is wrong because that is "culture war"; leftist aggression is completely invisible to them.