Zehaf-Bibeau, a Libyan-Canadian who crept up behind an unarmed guard in Toronto and shot and killed one, should be a strong warning to America. First, the guard was unarmed, a big mistake. Also, we should be more diligent about watching law breakers. This man has a long criminal record. Perhaps most important, we should be far more careful about who we allow to come to our country. The warnings are clear. Our leaders should be more concerned about our safety than about political correctness.