Earlier quoted context omitted.
Your estimated costs are pretty average, but I found the €30k figure curious. Used cars are dirt cheap in Germany, and they are often in really good shape and well maintained compared to used cars in other countries. I occasionally drive a 20 year old Opel that was purchased 7 years ago for €2500. It works great. I ride my bike most of the time, but it's really handy to have a car to haul kids or heavy/bulky stuff.
If you have kids, especially more than one, a no-car city center is a nightmare. Even in Europe.
We use public transit and bicycles (lots of parents have cargo bikes for transporting little kids e.g. https://www.babboe.de/lastenraeder/big).