Because it's a scam and the system is a grift.

I'm a pilot and own a private aircraft. Landing at any airport, even my home airport which is restricted by TSA is legal without any special requirement or background check. In fact, I have heard horror stories where TSA wouldn't let a pilot retrieve their aircraft for some bullshit administrative reason or another, so they enlisted a friend with a helicopter to drop them into the secure area to fly it out. Perfectly legal. The fact that the system can be brought down with a SQL attack is the least of it.