In my town people hear the two stroke racing racket and come out of the woodwork for a family walk or scoot or bike with the kids and wave and smile as they see me, there's some negative nellies, but those folks giving me crap about riding in the neighborhood are the same clueless blobs screwing up the freeway by parking in the fast lane in their hybrids or driving their 6000 lb SUV's like they have the accel/handling/decel of a Porsche Boxster without looking where they're going. If a loud bike makes people notice your existence and give proper space, I say it's a good thing. It's better to have some people that don't like racing or the sound of a two stroke revving out complaining to you than being just another road splat statistic as it seems that motorized bicycles are particularly disregarded on our roadways and its sad to hear when another avid rider goes down due to negligence or obliviousness.
Take it however you want, I like silence too, and I'm sure hikers appreciate the sweet quiet sounds of nature, and would like an electric trail bike for that purpose. I totally respect the CA laws regarding electric bikes, allowing electrics up to 750W (1hp) on the trails because I've almost been slammed by pedal powered downhill riders while taking a stroll on the off road trails around here, so if it's gonna be quiet, it should have some sane limit for power output and potential speed.
As electric cars become more prominent, and pedestrians and cyclists get caught out by their silent operation, I expect that artificial engine noises or alert tones will be required on all electric cars. The SAE is so concerned with the safety of lower forms of transportation that they are widening the engine to hood clearances and front bumper crush structure standards of modern autos to prevent pedestrian and civilian casualties from crashes. I agree that a crappy sounding car or truck in your neighborhood, or a poorly carbureted misfiring motorcycle can be a nuisance, but at least you know that they are there and by acknowledging their existence and position you can avoid having a potentially fatal accident with them.
My vote is that there be regulations that all new motorized vehicles sound like something off the Grand Prix circuit and makes a loud beautiful sound for everybody to hear and then avoid contact with. Imagine, a Prius or a Tesla that makes the sonorous bellow of a a naturally aspirated Indycar or Formula One car, and all motorcycles being required to sound like a spastic bat out of heck in the name of safety... LOL it'll never happen, the general public has a distaste for motorsports and can't appreciate it.