They haven't been able to point to a single instance where the TSA has prevented an attack. It's all security theater. So what do we do? Make it more invasive. More government for no tangible benefit.
In all, TSA security procedures are all reactive, not proactive. Failed shoe bomb, everyone now takes off shoes. Mixed liquid bombs, no liquids over X ounces. No sharp thingies. etc... etc...
The only improvement has been procedures on locking the pilot cabin. Sound, sensible security practice.
It seems one of the primary purposes of our government, to keep us safe from foreign threats, has jumped the shark. Instead of a comprehensive and well thought out system, we have many moving parts once again scrambling to make us feel safe. You know, that system we tried to fix after 911? Federal, state and local law enforcement all operating behind their own walls and not sharing. Now we are rebuilding that same broken system with the DHS and TSA.