HN user
There is one point I do not understand in your criticism: Musk makes it pretty clear that the plan includes a return ticket for anyone going to Mars. It does not seem hard to extend that to any child of colonist that would want to go back to earth.
The law making it illegal to deny the Armenian genocide has been invalidated by the constitutional council. The decision is quite interesting actually: - It is right to forbid denying the holocaust, as it has been recognised by an international jurisdiction (the Nuremberg court) - But it is wrong to forbid the Armenian genocide because it has been declared a genocide directly by the French government, so it could be used to censor anything. It seems a weird choice to me(I'm French), but it makes some sense. (http://www.conseil-constitutionnel.fr/conseil-constitutionne... -- in French legalese)
Also, free speech isn't absolute even in the US, for example I think you must also have libel laws.