...and this is how German authorities address the problem:
https://www.aljazeera.com/news/2025/4/14/germany-orders-deportation-of-pro-palestine-activists-what-you-should-know

If you don't see the violation in the article, that's right. They are worried about graffiti and a verbal offence committed in an attempt to protest the explicitly declared refusal to acknowledge "the war crime of starvation as a method of warfare; and the crimes against humanity of murder, persecution, and other inhumane acts" (as per ICC).