What part of nobody expects everyone to use a bike do you not understand?

I don’t care about the people who cannot use a bike. What I do care about is that the people who can start doing so.

You’d need to be in a dense area (city)

So? You make that sound like it’s a rare exception. Plenty of people living in dense cities, let’s start there.

If you’ve ever built something

I guess the carpenter in the example I gave you who started with one bike, now has three, and says it heavily reduced their use of cars hasn’t built anything at all in his life…