The police, you can hold the looters off unless the police get you first.
In an emergency the law goes right out the window. When you need protection from looters, it's the police you need to fear most, because they seem to be more afraid of the good guys than the bad guys.
Read the article on WND and see how the police behave when we really need them. After watching the second video, I think I'm going to join the NRA.