Violence against flight attendants by passengers are on the increase. The latest case was that of a passenger's wife who slapped a stewardess,I was told (see below post).
In the past,there were unreported cases of passengers abusing and beating up cabin crew for the slightest reasons.
Many times,these violent passengers got away and when they were hauled up to the court,they would settled with their victims by compensating a few bucks or at worst paid a fine.
These passengers were usually rich people and monetary settlement or a fine won't hurt them. Jailing them would be a deterrent. If they caused grievous hurt,they should be canned.
One thing I've observed,the same passengers would not dare to even raise their voices against the western airlines F/A let alone abuse or beat them up.