Because half the year it's freezing cold or blistering hot?
With CitiBike and so many bike lanes it basically already is a biker's paradise. Obviously there could be lots more improvements, but the people who want to bike already do.
I doubt that people who bike their kids in baskets daily in Amsterdam would do the same in NYC, given how dangerous it is. The risk tolerance required to bike in NYC is much higher.
I hate to break this to you but outside of microscopic Reddit bubbles like r/fuckcars and similar, people generally don't have a problem with car infrastructure and cars as a whole and most people see cyclists as the vegans of the transport world.
I'm not sure. In any discussion that's somewhat adjacent to transportation there are a lot of pro-car people that discuss the best type of a car (ICE or electric).