He's engaged in risky, irresponsible behavior, which speaks directly to his character.
Yeah, sure, burninman is a top, so he can wear a condom. And I don't think the issue is HIV status here...but that the guy participates in risky behavior.
By the way, I don't think anyone here would say that unprotected sex shouldn't occur between two guys in a committed monogamous relationship (well, if you can be sure of the monogamy, but that's another story).
This is a hookup...the fact that the guy barebacks indicates that he wants to screw...and that's the riskiest thing to do for both the top and the bottom, without protection.
Yeah, they can hold hands...but I am sure that's not what burninman wants to do. It would just take the "luster" off of my horniness knowing that the guy is so irresponsible, protection or not.