I don't know. The idea that someone would stand at a Presidential inauguration and throw a Nazi salute to the world is just so fucking bonkers and unprecedented that I'm inclined to think it was something else, like a tick, or a moment of mind-lost out of body lunacy. I mean, even a proper Nazi probably wouldn't do it (there's a time and a place, right?)
Drunkenness, drugs, alien body takeover ... absolutely anything is seems more likely than he actually stood there and gave a fucking Nazi salute!