So, is murder illegal in space?
I spent a few months sharing quarters with other soldiers when i was in the Army. We got to go outdoors, run about, work and relax. regardless, the urge to kill started to rise up in all of us.
I don't think we're going to go interstellar until we can deal with things like euthenasia (say you break a leg, or are crippled?) is Mars wheel chair friendly. And ageing, low gravity is a killer for bone density.