The president of the United States is the most powerful position in the world and therefore it's theft would be a great crime.
Accusing the political opposition of this crime in order to gain power is a massive evil
The problem with recognizing murder as a solution to evil is that evil is subjective, and sooner or later someone will use it as justification for murdering you.
Charlie Kirk may have been incorrect but he generally seemed to believe his positions.
He also didn't suggest it was a possibility he stated it was stolen