"And at the end of the day what happends between a couple (sort of a murder) is not our business - in most cases."
Unbelievable attitude.
A man assaults a woman 5 times and it is not the crew's business to interfere?
The police should have been waiting at the pier and arrested the perp on the aircraft and the guy should have been restrained.
Runway in Sight, are you saying that crew are are qualified as clinical psychologists and able to make accurate risk assessments as to whether this guy was likely to turn on someone else?
Tezzer, I agree with merlin XX and applaud you for taking positive action.