...Because they don't care about that crap. They are way ahead of your efficiency, often even ahead of the efficiency of a bus. A bike can get 70mpg without very much trouble and some more than 100mpg, and they don't cause traffic congestion in the first place because they occupy little additional space beyond the rider.
Gee, Maybe they're on to something, eh?
Edit: just did some research on electric vs. gas vehicles and their total environmental impact. Nothing specifically on motorcycles, but some of the data would apply.
"Based on where EVs have been sold, driving the average EV produces global warming pollution equal to a gasoline vehicle that gets 88 miles per gallon (mpg) fuel economy." https://blog.ucsusa.org/dave-reichmuth/are-electric-vehicles...
"In a 2015 study, the Union of Concerned Scientists found that gas-powered cars emitted almost double the emissions that contribute to global warming as electric vehicles, which can make up the difference from the manufacturing stage in six to 18 months of driving, depending on the size of the battery." https://www.businessinsider.com/building-electric-cars-how-m...
Most vehicles are not electric yet.
No motorcycle causes hearing damage beyond the rider, and this is caused by wind noise not the engine.
The "weaving in and out of crowded lanes" is easily solved: don't be a selfish prick, give them some room..
If generating incessant noise is your only way of staying safe on the road, maybe consider getting something not as risky. Drive a car or take the bus. It works for the vast majority of people, maybe they’re on to something eh?