It's a stupid amount of noise. I mean, hats off to them but I like my eardrums.

No, it means fewer smart people in cars, unless you're implying that only idiots take public transit.

Correlation=Causation; poors can't drive.

Correlation/=Causation; higher income per capita likely means better funded government and better roads and safety programs. It also means there are more protections for workers to prevent unsafe practices that are more likely to lead to accidents.

Why would that be a problem? For doubts, they will always exist and I kind of like it that way. It leaves room for possibility and wonder.

It's a good question and a line that has likely moved several times over the course of human history. We define things according to our understanding and then measure with tools that we have available. To think that either is complete would appear to be a mistake given the history.

You can't prove that they're not alive, only that you lack the ability to communicate with them.

That's too many people, not enough room.