One of these jerks will usually result in a 10-minute delay; two of them, maybe 15-minutes. And both will be easily identifiable. More than that and things become more confusing and the delays longer.
Complicating the situation is that closed religious communities usually close ranks when confronted with outside authority trying to discipline bad actors (see the paedophilia scandals in any given religious fundie community). So it may be that none of the others tried to help the flight attendants sort things out (again, not an excuse for Lufthansa’s collective punishment).
And, worse, some of the them have the gall to cry “anti-Semitism” when their generically crappy behaviour is called out. Which I suppose might carry more weight considering the historically fraught situation in this case, but is still insulting to innocent Jews subjected to actual anti-Semitism.