Not the worst idea ever: it's large, inhospitable and the climate is not especially conducive to layabouts (although the long winter darkness would probably be well-correlated to depression and violence).
We could try mars. We just send more and more in batches with resources. Until they start dying off in too large a quantity.
Hey, if it worked for the Americas and Australia.
There would be a perverse irony in Trump sending American murderers and rapists to Mexico.
You get to pick. Then we drop you off with a helicopter.