I'll be the first to admit that I know nothing about these biker groups. I can say, however, that I don't like ANY of them that ride into town, their bloody shafted mufflers roaring, circle the loop and go out again. If they didn't mean to, didn't need to, be intimidating (and what kind of personality is it that needs that??) they would have working mufflers.
At the very least, these are people who are the 'grownup' version of blaring, earth-thumping stereos.