California has one of the lowest average IQs of any state. If you remove the tech workers and the old-time republicans, there's not many big brains left to go around.
https://www.inc.com/bill-murphy-jr/we-compared-average-iq-sc...
The [Citation Needed] approach would make all comments boringly long and harder to write, all conversations white-paper like, which isn't bad of course, but has its place.
How many times I felt lazy and just dropped my comment because I knew that the [Citation Needed] comments were bound to come, and while I have a good insight about the subject, I had no will to spend more energy on that nor any inclination for taking flak from lazier unconstructive commenters.