Your question is invalid, but I'll humor you with a response.
First of all let's start out with the definition of authoritarian:
au·thor·i·tar·i·an
əˌTHôrəˈterēən/
adjective
adjective: authoritarian
1. favoring or enforcing strict obedience to authority,
especially that of the government, at the expense of personal freedom.
Notice the part about the government. That's kinda important.
a) The left has not altered any Constitutionally protected free speech.
b)If you're trying to silence the left publicly declaring racist, sexist, bigotry, and homophobic acts as such, then you're the one seeking an authoritarian solution.
a) Americans aren't
forced to engage in interstate commerce.
b) If you dislike the 10th Amendment, take your issues up with the founding fathers.
Americans identifying as liberals has increased as violent crime has gone down. Your facts are wrong.
Speaking of rhetoric...
"Single person expresses view. Guy on internet attributes it to an entire ideology."
The debate is over with scientists, and liberals, and a good portion of conservatives. You being wrong on the issue doesn't make the other side authoritarian.
Nope. Responding to this post has made me dumber, however.