Kimmel was talking about how Trump reacted. You know, like a stropping toddler, which is how he reacts to a lot of stuff.
I don't agree with Kimmel on the characterisation of the suspect. (In fairness to him, the information changed quite a bit in the first few days.) That doesn't mean I think his show should be pulled because the MAGA lot threw their toys out of the pram.
Leaders are supposed to be mocked, criticised, held to account, satirised, and poked fun at in a healthy democracy. When insulting or ridiculing those in power results in being shut down, society is in a dangerous place.