If one feels strongly about wearing uniform, crack on. Better to ask for forgiveness than permission after all. A bollocking is only a bollocking if you listen.
If you prefer to keep your occupation under wraps, due to threat of terror etc then do just that, and change into civvies.
Yes, ideally, the world would be a free and lovely place where we can stroll proudly around in uniform, and yes, I don't like faceless rubber backed folk nibbing me about this kind of crap either.
But both cases are with us, so make your choice and crack on.
Points/questions? (Is it only me who finds this argument quite easy to decipher?)