I have been wondering lately about the survivability of large bases on airless moons or planets. I can’t think of any way to protect a base on the moon or Mars from a deranged individual determined to kill everybody there. It seems to me that there will be many occupations on a base like that that would provide an involved crewmember with the opportunity to use that position to destroy the base or kill a lot of people, like rocket pilots. What would the population of a base have to be before it was certain to include some determined terrorists, deranged individuals or someone prone to snap? It seems like it happens here all the time but luckily we have air everywhere and nobody can depressurize the planet or crash into it and destroy it. Does anyone think that I’m completely wrong and if so why?