People need examples of good public transportation in the US beyond NYC or Chicago because those cities come with a lot of other baggage (high taxes, high rent, high CoL in general). Without an example, it looks to a suburbanite like the trade off is they lose their yard and 75% of the square footage of their home for less flexibility and a dirty transportation experience.
These people do not marvel at the efficiency of the Yamamote line as people are shoved in by train operators during rush hour. They hug the steering wheels of their luxurious personal space SUVs.
What makes it worse is that prominent politicians in the US on the side promoting public transport don’t bother to use it when slightly inconvenient (e.g. the “scandal” of AOC using a minivan when she could have taken a subway). Even people on the “left” aren’t leading by example.