Earlier quoted context omitted.
They indeed sometimes destroyed some properties But you cannot blame them for the violence in the protest they co-organized. People are free to attend the protest, and they cannot control them. They never called for violence against police. And most protest now in France have some people fighting with the police. The same way you can see firefighters throwing stuff (including petanque ball) to police during firefighe…
If it happens once it's accident, if it happens constantly, its their responsibility if not starting a protest at all would prevent the violence And if they put their label on it it's their responsibility.
Protesting for the survival of the planet we're all living on is not a crime it's a necessity to not go extinct.