They aren't. They are making larger vehicles to keep up with the demands for fuel efficiency (in gasoline vehicles) and max range in electric vehicles because of NHTSA regulations.

There absolutely have been better times to invest in public transit and expansion of transit systems. You require skilled man power for those things. Not just to build them but to upkeep them. And we're at a time where there are a lot of things that will need to be fixed first or we won't be able to have nice things. The mental health crisis for one, and homelessness/ rising housing costs for another. Adding infrastructure skyrockets the cost of living making affordable housing farther out of reach, and that adds fuel to the fire where the mental health crisis is concerned. You touch on corporate greed but you don't outright say we need more regulation. We do. But to get it we have to have people to enforce it. We don't have that either.