Move baggage claim to a secure area
I've never understood why baggage claim is in a public area right next to all the transportation. I could understand it 20 years ago when the only things that people put in packed luggage were clothes and toiletries, so there was no interest in grabbing anything from a victim's bag. But now, we have to check pretty much everything due to insane security restrictions, so there is now a lot more valuable stuff that can be grabbed from them. US airports have those "point of no-return" gates, so why not add a second set just after baggage claim? It'd greatly reduce the number of stolen bags and no one could bring a bag back into the "secure" area.
Although I've always thought that they should set up automated kiosks where you scan your boarding pass and the machine spits out your luggage.