That's because, like the majority of people, you are probably quite bad at understanding both randomness, and the normal behaviour of violent assholes.
Um, sir, I have more than a layman's understanding of randomness, thank you very much. This is Hacker News; all kinds of people post here.
I'm not even sure what you mean by "random" in this case; we're talking about one event. I didn't say anything about the distribution of violent assholes in McDonalds or France in general. It certainly wasn't "random" when the first violent guy brings over other employees who happened to also be violent. I don't know about France, but in the US, there are strict laws on what a commercial establishment can do to get someone off the premises. Now, mafia-run operations aside, most places would just ask you to leave and threaten to call the cops if you remain.
Was just meaning that randomness tends to be clumpy and that violent assholes are more likely to be violent assholes when there are a few of them around, so the fact that they were three of them does not particularly decrease the chance of it being a random incident in comparison to there only being one violent asshole.
