I agree that despite how conscious and concerned the government and travelling public is about security, it appears to be very spotty between airports.
Have you tried flying on a prop from an extremely small airport, cleared their minimal security, and when you arrive at a major hub like ORD, you can go right on to a major flight?
This was done for the convenience of the passenger, but frankly, I'd rather clear security twice than risk a less than full security check for all of my fellow passengers (it's not that I don't trust you, but there may be someone we shouldn't.)
Also, I thought it was a tragedy when airlines started making security the "baggage cops" when they installed the bag templates. Could we possibly add any more distractions to this department?