Yeah show them who the bands are. Show them that they are good people with good messages like in the song Famous Last Words or Hold On Till May, and then show them the shirts you want so that they know you're not parading around propaganda or something.
Show them a picture of a shirt that you want and ask if it's ok. They may be really picky, but hopefully you'll at least be able to wear SOME merch.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.