I've seen lot's of conspiracy theories that Israel had Kirk killed because he criticized them once or twice, but I don't think that's true.
I think Trump had him killed, but why?
Because Trump needs a victory, he keeps picking up fights and trade wars and losing them, the american economy is in a recession, the job market is in the toilet, the only thing proping the economy is a AI investment bubble.
he needs a win, he needs to win a war without losing soldiers like he would in Venezuela, and that war will be fought at home, against the smallest but most deranged aspect of leftism, troonism.
it's no coincidence that the only, and I mean only piece of iformation we have about the killer is that he engraved trangerder messages in the rounds that were in the rifle, unused.
Trump killed someone popular and close enough to him just to have an excuse to start a nation wide war against troonism, no one is going to think he's going too far, since he's "avenging his friend". it's also no coincidence that Kirk was killed one day before Trump was set to give his big "9/11 enemies of america speech".