What makes you think AZ has lax enforcement?
Loughner was able to buy a gun, to start with.
Loughner was a law abiding citizen right up until he started shooting people. Why shouldn't law abiding citizens buy guns?
Loughner would have been able to buy a gun in any other state as well if he were a resident there.You fail, again. For the umpteenth time.
Because he was batshit crazy and everyone in his life knew he was?
But that's okay, there was a gun sale to be made.
And this is the problem with the issue. The people who make money on guns are the ones callign the shots.