If Martians were settling here and some of them were preaching war against us and periodically killing us and blowing things up would we blame radical Martianism or would we say that the Martians need to go back to Mars? Would libertarians insist on a free right to travel between Mars and Earth? Would Republicans demand more off-world workers and tell us how the growing green population is expanding our economy? Would liberals lecture us about the universal brotherhood of intelligent life? Would our leaders worry about the potential rise of anti-Martian extremism everytime a Martian killed someone or would they begin sending the aliens home?