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Like H*ll it isn't. 
In a way it isn't.
If all stickers, etc are banned...then
all have to be.
The problem is...there are lots of derogatory images of the American flag. If stickers of the flag are allowed ...what are you going to do if it's a derogatory one? Who determines which ones are acceptable and which aren't?
You know someone will test how far they can go ....then get the ACLU involved because their "rights" were being infringed upon....and on and on.
Pretty sad really, that someone with the right intentions, is "punished" because there are those who don't have good intentions.... who will create issues that will affect those on the side of right.