Kidnapping is for sure not acceptable. Stripping the clothes as well, it was very criticized everywhere in the world including France when the AirFrance HR cunt got his shirt destroyed. If you work in France in the future, don't be scared about being kidnapped by your co-workers. It's very unlikely, especially if you are not a bad CEO, and I don't remember physical harm happening. I'm not saying it's acceptable, but it's a very small risk and you should not dismiss the benefits of protesting for only a few protests that went wrong over the last 10 years.
Well the persons responsibles for stripping the Air France HR guy got 3 to 4 months jail sentences, so I don't know if I would call that "tolerated".
At the same time, in the US there's litterally an idiom for starting to kill your coworkers if I'm correct : "going postal".
So, overall, I prefer the most violent thing to happen at work to be shirt stripping.
I've heard about workers in France literally kidnapping and stripping the clothes from their bosses and it being tolerated. I think that kind of thing is never tolerable under any civil circumstance. If a co-worker tried to kidnap me I'd see that as a threat to my life and I'd be fighting for survival.