Charlie Kirk directly called out the jews (nitter.net) (direct link (x.com)).

Someone close to him said he was afraid Israel would kill him (nitter.net) if he turned on them (PDF mirror (vid8)).

I have no doubt this got him killed. Someone with the influence he had, would do devastating and irreversible damage to israels already shit reputation. Seeing this makes this whole thing make sense. Jet leaving right after, yup. mossad. Short timeline makes a patsy difficult to source. So leave a tranny rifle and you have the direction to send the media.