This isn't Europe, and you can't necessarily repeat the same things that work in Europe and expect them to work here also.
That's not correct. Parts of the US - especially in the north-east - are very much like Europe, and both heavy rail and light rail are viable in those areas. That's also where the bulk of the population lives.
You live in a very big and diverse country. Just because something won't work in rural Arizona or Nebraska doesn't mean it won't work anywhere else.
"I never let my schooling get in the way of my education." -- Mark Twain