Chris, every proper martial artist in Japan knows not to wear dogi outside of class.
try not to analize it to much. Just accept it. Are there exceptions? Absolutely. Mostly with kids and older people. Is it still wrong? I feel it is.
Have you really deeply thought about why most folks feel it is wrong?
Anyway, enough ranting.
I've lived and trained in Japan for almost ten years and I've encountered any number of "proper" martial artists who don't feel the way you do. Just accept it :-).