Your assumption that busses exist so they can be improved is quite telling. Huge swaths of the population, even living in million inhabitants+ cities, simply are not served by any form of mass transit.
The reason public transit works so well in Germany (where I did live for a bit) and Holland (visited and read about) is not because taking a car is more expensive. It's because mass transit works well, it's there when you need it, gets you to your destination in reasonable time and comfort, and is easy to use.
The very urban fabric in the USA is car oriented. Every little bodega has to have a dozen parking spaces built by law. Supermarkets have 3 to 4 times their store area wasted in parking lots. Everything is far apart because of this, so walking is impractical. With everyone driving to places, you need wide, fast roads, which makes biking places very unsafe. Every once in a while I see a white painted bike attached to a memorial in a light post, commemorating a life lost. And I live in the suburbs.
It's not an insurmountable problem, the Netherlands did that in the 70s. But any solution that proposes a simple fix is doomed to failure. This has to be a concerted, intense effort to work.
That's because mass transit is, with very few exceptions, absolutely ass in the USA. People only use it as the absolute last resort. That skews the table a lot against any public transit.
Addressing the problem of bad journalism? Because that was the criticism.