Well, there are plenty of cars in Berlin, so unless they're all masochists they probably enjoy that more than the other options. That I personally can't see why doesn't change that.

To add to this: I wouldn't call it "most car friendly city in Germany", either - but driving there isn't "hell on earth" either: I felt it's neither better nor worse than e.g. Kaiserslautern or the 10k inhabitants "city" I went to school - the traffic is just on a different scale due to the city being huge (compared to most other German cities).

(Disclaimer: I'm a relaxed driver; my experience might not hold for those who enter the full-rage mode when starting the engine)

Berlin built a very expensive tunnel in the city center, still expands the inner Autobahn ring, has large east/west streets (Stalinallee and 17th June), parking was free in residential areas until very recently, tickets for parking in the wrong spots are a joke and cars parking on sidewalks or bicycle lanes are pracically never ticketed. Bicycle police which was introduced to ticket cars and bicycles practically in the same way never tickets car drivers [1]

Compare this with the pedestrian infrastructure (many bad sidewalks in the East) or bicycle with no or chaotic lanes [2]. Also when houses are build or roads are maintained, car driver concerns are always prioritized above cyclists and pedestrians [3].

[1] https://rad-spannerei.de/2015/07/14/berliner-fahrradstaffel-...

[2] https://www.tagesspiegel.de/mediacenter/fotostrecken/berlin/...

[3] https://www.tagesspiegel.de/images/schild-soeren-dumpf/22966...