Did you read the article? I'm curious because I didn't find that to be in any of his points.

As far as I can tell, he is pointing out that people (extreme conservatives, extreme liberals, extreme religious, and more) who won't budge on an issue that is largely of little cost to others in society tend to get their way in such a manner that most of the rest of the society has to go along with it. (Incidentally, I don't like the way he uses the word "intolerant" too broadly for this phenomenon, as it leads to a title which sounds like it could be about what you have suggested it to be.)

I must agree. There doesn't seem to be any evidence based remarks here. Certainly some facts sprinkled with a fair amount of conjecture in an attempt to support an argument with a preferred outcome. I got about one third of the way through realising it was basically a list of grievances and headed to the conclusion to see what was actually being suggested. Unfortunately, there isn't one so I am no wiser as to the author's justification of his position.