Upvote:1
'Secure' applies to the TSA's understanding of 'free of weapons and other stuff that is not allowed to be carried on an airplane'. It has no relation to 'crime-secure' or even 'crime-reduced'.
It is a different question if thieves would consider this a good area to work in; as they would have to show an ID when entering, and will probably be video-recorded in the terminal, it would be quite risky - even being seen by a by-stander gets you caught for sure, as there is no simple running-away possible. Therefore, most professional thieves would probably roam in other places.
[consider also how easy it is to walk into any airport to the luggage belts, pick some nice suitcases, and leave - but it's not happening much. Obviously, the video-taping makes it quite uninteresting for thieves.]