Beyond the obvious state censorship issues here, its worth noting that Kimmel's monologue on Sep 15 appeared before add'l evidence (texts, discord chats) came out about Tyler Robinson's incoherent beliefs. This means that Kimmel's implied accusation (Tyler was MAGA) was a real possibility at the time, rather than willful misinformation.
I took his statement to be deeper than MAGA vs liberal.
Regardless of the spin, the view that political opponents are existential risks to the republic and thus demand to be killed for the good of all of is what he was suggesting that is shared.
Yes, this is more or less how I read the statement, but I can see why others had a less charitable reading. I don't want to nitpick it too much, because its a pretextual charge during a tense moment.
