I think you're getting cause and effect mixed up. Save for a few petrolheads and train enthusiasts, people use whatever happens to be the most convenient method to get around. In North America, most cities prioritise infrastructure for private cars to such an extent that any other mode is almost useless

Since private cars scale badly, you want to encourage people to take other modes, but in order to change behaviour, the alternatives need to be attractive - cycle layouts that are safe, buses and trains that are frequent and reliable, city layouts that don't involve a long drive to buy food. You can't convince people out of taking the rational choice. You have to build it