Muse this - train is a tool, just like a car, bus, bike, plane, drone or rollerblades.
Repeating "trains" in every transport context is unproductive. Each mode of transport requires certain density. Most US cities just don't have it. It's that simple.
It's not at all that simple. One of the neat things about trains is their permanence - once you've built one, you can fight for allowing increased density repeatedly until you win. That's what we've been doing in Seattle!
No