In a city, bikes are useful because everything is compact and therefore relatively easy to reach. If more people go by bike, the traffic must adapt to bicycle popularity (as happened in Berlin, as is default in The Netherlands). Public transport is also good because its popular and various options for various ranges (tram, metro, train, ferry, etc). If both of these are good, the need for cars is less there, and public parking spaces are usually sparse in big cities, therefore expensive (also the required security costs money).
One thing car/bike have which public transport don't is that you are in a relatively private space instead of sharing the commons. In COVID-19 pandemic that's a plus, if you like being social to strangers (I don't, I'm a private person, but I don't condone such behaviour).
It doesn't have to be completely anti or completely pro car. Just like with FOSS and veganism and what not, there are shades of gray, people.