What evidence do you have that he "killed in the name of his leftism?"

As far as I know, there is no evidence of a specific "leftist" motive and no connection has been found to "leftist" organizations. Bear in mind that many Christians were opposed to Charlie Kirk's politics, and right-wingers didn't feel he went far enough. So that alone isn't evidence of "killing in the name of his leftism."

The memes aren't hard evidence either, since they're just memes.