I really want to know what their angle is and how they are supposed to benefit from this, yes, there have been resources on Mars found, but because of how far away it is and how there isn't a natural supply of oxygen they probably wouldn't last a day, going by that logic, the moon is closer and we already have operations going on there so there's a better chance of rescue if something goes wrong.
If they state the known dangers, and if they state that they don't know what all the dangers are...
People throw their life savings into gambling. In this case the gamble might have aesthetic value rather than monetary value. The colonists feel that they are moving to expand our living spaces.
While I personally would never do this in this kind of a way, I vote for freedom for the people. Sure, explain to them how stupid they are, but let them be free... as long as I am not forced to pay their way through taxes.