I have a Triumph sticker on my truck, half a dozen Triumph t-shirts, and even a Triumph leather jacket (although you can't tell unless you look close.)
There's nothing wrong with wanting to show your association with a group that shares common values. We all do it to some extent. Of course, a t-shirt is one thing - looking like a Harley store threw up on you is something entirely different!
Is there any other brand or label on earth that goes to this extreme?