[SoftTalker]

You can say the same thing about most federal spending.

Car and truck owners pay fuel tax and registration tax (hundreds or thousands of dollars a year, especially heavy trucks) which all ostensibly goes to road upkeep and related infrastructure. It may not cover all the costs but neither do transit fares.

I don't know anything about Boston's system but most transit agencies would need to have fares in the tens of dollars per ride, at least, to come anywhere close to covering their costs. This is much closer to the costs of using a car, probably not coincidentally. Getting from point A to point B has a value that is independent of the transport mechanism.