Weird news: Man did not get a sandwich, punches stewardness
So, while earlier troubles would have been hushed up, now, at the sign of trouble, other passengers get involved; if there is an air warden on board, he or she would also get involved; and the pilot could make a quick unplanned landing at the earlier airport in order to deboard such a person; and the report from the pilot while requesting the landing would ensure that security was available at the airport to arrest the offending passenger (link to article):
An easyJet flight was forced to make an emergency landing in Rome after an infuriated passenger allegedly assaulted a flight stewardess ‘because he was waiting too long for a sandwich’. A male passenger on a flight travelling from Geneva to Pristina in Kosovo on Tuesday morning allegedly punched the female flight attendant and knocked her to the floor. A witness told the Mail Online he had shouted: “I’ve been waiting for hours, I’m hungry,” and claimed that he carried on hitting her while she was on the floor. The witness said fellow passengers quickly stepped in and restrained him.