That’s what he says, anyway:
“It’s not just a coincidence that I look like Jesus. I am the modern-day Jesus Christ that you all have been waiting for.”
So that explains it. In his mind, he was trying to take out an impostor.
P.S. Speaking of impostors, an 11-year-old boy in California was expelled from school for saying a local newscaster looks like Obama. Which you’d think would be a compliment, since Barry’s so dreamy. It reminds me of the people who bristle at the term “Obamacare” because it’s somehow derogatory. If Obama’s so great, why is it wrong to associate other people and things with him? Maybe they’re offended by taking his name in vain…