Who is responsible for cancel culture? Tech censorship? "Believe All Women"? Who is calling for a new War on Terror targeting the domestic population?
This depends on is being cancelled. It's not the left that cancelled Kapaernick or the artists formerly known as the Dixie Chicks or howled with rage that the Supreme Court - with the exception of three conservative justices - ruled their longstanding practice of cancelling gay people unconstitutional.
Kaepernick kneeling during the pledge of allegiance can only parse as an antiracist gesture if the thing being disrespected (flag/country) is presumed to be intrinsically racist, i.e. it's accusing the whole country of racism. There are a lot of non-racist patriots who would take offense to that. The answer still shouldn't be censorship, but calling any opposition racism is accepting the very premise that the people opposed to the gesture are opposing it over.
Moreover, the implication that everyone who has been canceled was a racist is contrary to evidence unless you're making some heavy tribalist assumptions about anything vaguely conservative automatically implying racism.
And you're still not addressing the original point, which was that the left going around canceling people over speech is inconsistent with freedom of speech. Nothing anyone on the right does can make that untrue.
Libertarians making money.