I’d argue there’s a big difference between wishing someone to be killed, and witnessing them almost die and wishing the outcome had just been a bit different. Like, you don’t want it it happen in the first place, but have an opinion on the outcome if it did anyways.
He’s not saying “I wish someone would go out and kill Trump”, it’s “if a bullet was already flying towards Trump I wish it had hit him, especially instead of a random crowd member behind him”.