I did scan through the thread and can't really see what you think the issue with it is? The government made a good attempt, with lots of ongoing dialogue, aimed at preventing the spread of disinformation (based on the best available info).
And no, Kimmel did not say the shooter was "MAGA" and, even if he implied it (or even if he explicitly got it wrong), so what? Covid disinformation wad deadly on a mass scale - a comedian getting a fact wrong would be a comedian getting a fact wrong. Heck, news channels routinely get things wrong and are seldom cancelled, and Trump tells outrageous lies all the time.
And beyond that, it's already widely believed that Trump got Colbert cancelled (because he makes fun of Trump, often pointing out Trump's lies), and Trump has even said Seth Myers will be next? Do you think that's based on a prediction that Myers will say something factually untrue in the future, or because Myers is a frequent critic of Trump?
There is a world of difference between a government trying to protect public health and silence dissenters. That, of all people, the administration is prioritising going after TV comedians who joke about Trump is, in a sense, laughably petty (and obviously personal). The President is silencing free speech because his feelings got hurt, and such disrespect is (apparently) no longer justifiable in the US.