"The problem is that people of Palestinian or Arab descent feel that they cannot express their concerns and criticisms."
No, the problem is that many seem to be completely unable to get rid of the people supporting their criticism while openly calling for the killing of all jews.
There were peaceful protests in Germany. Nobody had a problem with those. But the majority was instead infested with radicals that should have no place in a civilized society.
There is also a lot of criticism of Israel's government. And funnily enough we can read all these statements in international as well as German media... while they are being actively censored. Sure.
If I publically talk about a topic and half the audience cheering are nazis I will stop, reevaluate my message and clearly distance myself from them. When you 'protest peacefully' to critisize Israel's government however it's okay when a big share of attendees carry symbols of terrorist organisations. And if those protests are then banned it's "censoring of Palestinian human rights".
Don't get me wrong here... I am the first one telling you that the current government in Israel is a big part of the problem (for the very same reason: not distancing themselves from the radical morons - no, it isn't enough to speak out against statements of some government official later, those people can't have a place there at all).
And the official German government statements were clearly lacking balance. But they were widely and loudly criticised publically for it by many. And many called their initial reaction a massive overreaction. (Again... that was public and not censored...)
Yet many of those who camplain about banned protests and censoring however have actually another problem entirely: That they often can't (or don't want to) distance themselves from that strange other half of "Israel criticsm" that is in fact criticising their right to exist.
Fix your own side of the bed first, then you can start complaining.