This is where I think you have a skewed picture of reality.
In North America 20% of people live in rural areas.
As much as I wish that was "vast majority" it isn't.
Your simple view of public transit doesn't line up with the realities in North America. I wish it did, but it doesn't. And unfortunately your uninformed arguments are the fuel actual opponents of public transit use to justify their position.
It doesn't help the cause to spread uninformed arguments
This isn't about capturing carbon that has already been released though.