Riots like these are what you get when you prevent any other forms of protests: banning protests (illegal but by the time you get through court to get the ban lifted it is too late), making unions and strikes irrelevant by never ever yielding, preventing votes in the National Assembly using pressures on MP and all that the means that our constitution allows to bypass parliament, even though there is no clear majority for whatever you are doing, forcefully removing peaceful protestors, etc There are reasons why unions was good for everyone, elite class included, they allow peaceful resolution of conflict. If you remove all peaceful avenue, there will be people going into the not peaceful avenue.
I am not advocating for violence. However, it is not historically acurate to say that violence has no benefit. As a matter of fact, I can think of instances in the 18th, 19th and 20th century where violent protestors obtained rights or the end of some kind of oppression. I am not sure I can think of even one instance where anyone got anything without some kind of violence (or destruction of private property), even in the 20th century (there was violence in the May 1968 protests, or in the 1936 strikes, etc). The term “sabotage” itself has something to do with workers destroying the workshops by throwing their shoes (called “sabots”) into the machine.