The left has intolerant people as well. "No matter what side of the argument you are on, you always find people on your side that you wish were on the other."
However, somehow they aren't running the party like they are on the right.
This is nonsensical. Tolerance is the region between what you like and what you fight. There are lots of obviously bad things you shouldn't tolerate (like murder), and lots of mildly distasteful things you should.
Someone else being less tolerant of something than we think they should be isn't some special category of evil. As with anything else, you have to decide whether a particular case is bad enough that you must fight it, or ambiguous enough that it isn't worth the conflict.
The intolerant left seems to have Berkeley buttoned up.
This is the danger of progressive supremacy and the only way out of this hell-hole is encouraging true diversity and inclusiveness -- diversity of thought that includes right-wing conservative viewpoints in addition to those of the left.