Airport security prevented the September 11th hijackers from using guns. They managed quite nicely without them - as will anyone intent on murder.

BillD - I would be interested in seeing the statistics on shootings involving illegal weapons vs. legal. I am not disagreeing with you but my problem is that NYC has tough gun ownership laws and still it has one of the highest gun murder rates in the country. If someone is intent on murder, he will find a means.