> Yet a democratically-elected government made a decision in the name of the people to replace this park with a shopping mall.

So what? If yours "democratically-elected government" orders you("in the name of the people", of course) to kill jews, will you comply?

> are effectively overturning democracy in order to protect their personal interests.

So what? When majority votes, does it protect personal interests of someone else?

> e.g. Art. 20.4 of the German Basic Law – does the Turkish constitution have a similar provision?

You have so much subordination to government-made law, so even if you would really want to overthrow tyrannic government, you would stop because there is no law allowing you to revolt?