In my world there is no such thing as "checked baggage". If I can't carry it on the plane with me, I don't take it.
Cmon people, you really think those little, tiny locks on bags are going to stop a determined thief???
Geez most bags are made out of cloth that could be sliced open in seconds with a sharp knife, locked or not!
At least you can watch the TSA search your bag but what happens to it after it goes out of sight down the belt?