I think loud pipes from a few are going to be the undoing of us all, eventually. It doesn't matter if it's H-D straight pipes, or pipes on a repli-racer from one of the Big Four, running down the road at 10K rpm. Even the AMA has finally started to address the issue.
Loud pipes are likely going to be the undoing for any type of motorized recreation- bikes, ATVs, jet skis, cars, pickups. The public is just tired of it, and there's a lot more of them than there is us. Like it or not.
I happen to ride a very quiet bike. I like it that way. I do lots of long-distance touring, and noise is just one more factor contributing to fatigue. I wear a Hi-Viz jacket, have lots of reflective material on my bike, and have supplemental lighting front and rear. I think these give me as much conspicuity as loud pipes, with none of the bad PR... Hi-Viz may not be real high on the cool factor, but I can tell the difference in other vehicle's behavior toward me when I wear it.
Just to stir the pot- why do so many folks with loud pipes feel the need to rev the engine incessantly while at a stoplight or while backing into a parking space? I asked a guy with straight pipes when his brand put in a reverse gear. He told me he didn't have a reverse gear. I asked him why he was revving the engine while backing up.
I don't think he even picked up on my sarcasm...