Did you read the article you cite? First it is not about somebody doing a peaceful protest, it cites links to an organization or movement that is considered illegal. I do not even agree with it and I think it was totally wrong for the German Government to do so, maybe they wanted to appease this clown Erdogan. However, the article says that it is the very first time and it had never happened before that Germany did something like this. And again, show me reports that foreigners who peacefully and without any offensive or aggressive actions voice their political views, would be deported and blacklisted.