It can be two things. Most people citing molon labe online like this have a desire to use their guns in self-righteous justification. This guy already has, got away with it, and was celebrated by terrible people. He also got on the outs with the same crowd that loved him by saying he wouldn't vote for Trump over his gun rights record(then quickly tried to take it back when Maga went against him).

He wants his adoring fans back, perhaps not realizing they didn't like him, they just like that he got away with fulfilling a fantasy many of them have: killing people they hate.