The left is about tolerance.
It is the only place where tolerance is even talked about.
Intolerance may not be from the right but it is most definitely not from the left and to say it is is merely to not know what the left is.
Nah. I think that's the No True Scotsman Fallacy. You just don't identify with the intolerant leftists. The right-left dichotomy has nothing to do with tolerance. Both sides are all over the map. Leftists can be extremely intolerant. The political correctness movement is all left, and all extremely intolerant.
I think the right often talks about tolerance. But their stance is so entrenched and unified that they don't come across as being aware of it. Good luck trying to get anybody on the American right to support infringements on free press. That is evidence of tolerance.
Yes, the left is more intolerant by definition. The right-left dichotomy is based on attitudes about change, not on tolerance or intolerance.
The right puts a high value on tradition and the existing social institutions like religion to solve the problems that appear in society. They have a low tolerance for changing the institutions that they put their trust in.
The left sees change in society and in its institutions as the solution for problems which they view as created by those institutions. They have a low tolerance for tradition.
Obviously neither can be right, as in correct, about every issue. Also, no one is consistently conservative or liberal on every issue.
The US is overwhelmingly conservative right now. This is due to many factors.
The electorate in the US is getting older, the young are more liberal, as people age they usually become more conservative.
The rate of change in other aspects of society, the arts, technology, industry, relationships, etc., is accelerating. Politics is one of the few areas in which people feel like they have some control, that they can put the brakes on the rate of change.
And people become more conservative as they become more fearful. We are afraid of terrorism, spreading fear is the main aim of terrorism. And people fear the future. My generation of the baby boomers is the first generation seeing our children and grandchildren facing a worse life than we have had and most of us don't know why.
And the world has become much more complex. As a result more people on both the left and the right increasingly depend on ideologies to simplify the complexity, "government is the problem" or "corporations are the problem", for example. People don't consider issues on the merits of the issue, they instead try to apply their ideology to it as a short cut to actually understanding it.