Can we drop this notion that Kirk was a free speech advocate? Like many on the right, he wasn't pro free-speech, he was pro right-wing speech.
He and his organization published watchlists, to "name and shame" university professors who espoused left wing views.
He was a partisan hack, who sought to oppress views he didn't agree with.
He was, of course, also a prominent ally of Donald Trump, who has passed laws and sought to deport people over their Pro-Palestinian views, and has repeatedly attacked the free press.
By all means, mourn Kirk's death, be angry at his murder, but he was just one more of a long line of right wing gobshites who dishonestly hid behind the slogan of "protecting free speech" while stifling it.