The fact that there are plenty of loud motorcycles is part of the reason why I converted one to electric.
This is a photo of it on the dynometer at this summer's Harley 105th Celebration.
The motorcycle clocked in at 12 HP.
Most of the cycles that had been on the dyno were modified to be loud. A person could hear them for miles while revved up on the dynometer.
When I left the event, I just tailed a couple of Harleys for a while. No problem keeping up with them. Not bad for only 12 HP and no gasoline!
Come to think of it, I'm sure the AMA (American MEDICAL Association) must have something to say about hearing protection. They recommend wearing ear muffs while mowing the lawn, but if you do that on a motorcycle, you may miss hearing somebody's horn.
I quieter motorcycle seems safe and friendly to me. I've always liked the sound of the big and quiet Goldwings.