>"Motorcycles are unfortunately NOT more efficient or less polluting than modern econoboxes on average"
That entirely depends on the motorcycle and car you are comparing. A small, modern motorcycle can get 70+ MPG and has all the same pollution controls as most modern cars. The AVERAGE of passenger vehicles on the road in the USA is 25.3 MPG. And I will count a dozen huge SUV's for each econobox car on the road. My motorcycle is a 2011, has only a single CAT, and has massively powerful 4cyl 16v 1.4L engine, but still gets 44MPG, which is twice the efficiency of my non-SUV 2009 car, and it emits half the CO2 and probably still pollutes less NO2/etc.
>"Automobiles, even the biggest and dumbest coal-rolling dudebro trucks with the shortest sidewalls, do basically zero damage to roads."
*ALL* vehicles damage the roads. It just varies by weight per tire. And huge battery-powered SUV's weigh a LOT. GMC Hummer EV weighs more than 9,000 pounds! The Rivian weighs 7,148. A Honda Civic sedan is about 2,800. Of course, it is true that commercial tractor/trailers blow all that away and cause, by-far, the most damage, but you also have to factor in the weight per square area of TIRE contact, then it doesn't seem quite as extreme.... at least until they hard brake :)