> Because it's hard to unanimously and unequivocally identify those who are intolerant as such.
> This seems to be the MO of this so-called "alt-right" stuff; legal or constitutional barriers are almost impossible to define or enforce.
These are fairly creepy statements. Very difficult to apply a charitable explanation to what you're saying.
> Owing to the beguiling nature of language and rhetoric, the intolerant can thrive and propagate
Sounds familiar.
What I am trying to say is that there is no need to identify intolerant people. All that is needed is to make sure that intolerant and tolerant people do not limit free speech. Protecting free speech can be done without worrying that people will misinterpret laws. For example, a law saying that anyone wishing to publish something to their site can do so regardless if they are anarchists, Nazis, conspiracy theorist, or anyone else. No mater how much hate the intolerant write they will not be able to stop other people from writing about how much they hate the intolerant people.
So we have the intolerant people in the government trying to suppress dissent from the tolerant. This is described in the first paragraph from the wiki link.
If there was a law to be created today making a list of speeches that should be suppressed, what topics do you think would be on there? With the current government, probably things like making it illegal to claim that climate change is happening.
If the left really wants to protect themselves during the upcoming 3 years, I would expect them to try to make free speech as protected as possible before it is too late.