Well, who's the burden of proof on? Your logic also applies to god, ghosts, cupachabra and why Jamie Eason isn't naked in front of me. It also can't be proved false that within the next 5 minutes I'm going to grab a knife and disembowl my neighbor. Your last question almost verbatim exactly states what I said before. Life outside our tiny rock has to exist because there's a ton of real estate available. No causation, no correlation, no nothing. It isn't arrogance to say were all that's out there. At this moment in time, it's reality.