There are cities that are geographically suited for some forms of mass public transit.....Manhattan being the best example......a long narrow island, with limited points of entry and egress, with a huge poplation of commuters in a confined space.
That said, the bulk of the expensive infrastructure for the NYC subway system was completed 150 years ago, when construction, regulation, and labor were a tiny fraction of what they are today. Even with all of the construction being complete, and with a very large "ridership", the Port Authority of NY & NJ looses billions a year keeping the system running.........it still is a dead loss for the city. Over a decade ago, when I lived there, a subway token cost a dollar.......a study was conducted that determined that if the system were to operate at a profit, based on fares, a token would cost $10.......it would likely be twice that today......
So no, I cannot logically support public transit of any kind that is not self-supporting financially.......and that will never happen, because the people who are its most likely users, can never afford to pay for it......
doc