Thanks for including that underappreciated quote from Mill. I am surprised, though, that you also didn't mention two other quotes from Mill that buttress your great argument.

That the only purpose for which power can be rightfully exercised over any member of a civilised community, against his will, is to prevent harm to others. (On Liberty, 17)

and

The answer to wrong speech is not censorship but more speech. (paraphrased)