[notanzaiiswear]

So most Berliners know nothing about economics?

The park would not be "given to the rich", presumably the parts open for building would have been sold to "the rich", with the money benefitting every Berlin citizen (ideally - but we know our government her is composed of very good people, right?).

Also what does it matter if the "rich" rent out their old apartment? What is needed is supply of apartments. Per supply and demand, more supply means lower prices.

Do the people expect to live in luxury apartments for little money?

And it is very touching that nobody wanted to live here 40 years ago and the people held on. But then they could have bought their living places for very little money. Also the whole place was subsidized by the USA as a stand against the Soviet Union. The people staying benefitted a lot.

There already is a construct for the place where you live belonging to you: it is called "buying your own place to live". If you choose to rent instead, you signal that you don't necessarily want to stay forever.