I completely agree with your position, I'm the same person when I'm in uniform or when I'm in street clothes. My credentials should be the determining factor if I'm a known crew member, not the clothes I'm wearing. But to make my life easier, I just carry a non-uniform shirt in the outside pocket of my suitcase, go through security in uniform then once in the secure area, I just swap shirts in the bathroom. I think it demonstrates just how silly TSA procedures really are but swapping shirts makes everyone happy.