I'm upset because the government put a bunch of roads in between my house and the other places I like to go, so I have to be around cars in order to get places. I don't think that's fair.

Even in the most terminally car brain culture there is effort made to separate pedestrian and automobile traffic

What's a "crosswalk" then?

I can't speak for elsewhere but in much of Canada the situation is opposite what you're suggesting. Bicycles are legally considered vehicles and are expected to use the road with other traffic if no bicycle lanes or designated paths are available. It is illegal for them to share the sidewalk with pedestrians.

This is, however, very rarely enforced.

It's bad faith to claim that city streets are exclusively for cars. City streets have always been mixed use spaces historically.

Cars are so dangerous they annexed the mixed use spaces they run in. Cars are a threat to everything around them. Bikes are forced into conflict with pedestrians as much as they are because of the amount space that has been seized by cars.

Roads need to be rebuilt to eliminate or control cars to make them safe to those around them. Cars are the most dangerous thing on the roads, and should be treated as the threat that they are.

Mixing pedestrians, bicycles, and motorbikes on the same path is fine though, motorbikes can go around pedestrians in a way cars can't.