I mean there is the incentive to avoid extinction by random asteroid-scale disaster. I'm not saying it's an amazingly good incentive, and maybe it would be hard

I mean there is the incentive to avoid extinction by random asteroid-scale disaster. I'm not saying it's an amazingly good incentive, and maybe it would be hard for a colony to become independent of support from earth, but for some people it is an incentive. Also I'm not a Musk fan and I'm not necessarily supporting spending money to go to Mars right now so that's not why I'm saying it.