If you feel sick and it could be emergent, you can push the red button.
Coughing might result in coughing blood.
Dizziness might result in stroke.
Heartache might result in heart attack.
It might or might not end up to be an emergency but as long as you foresee
it as a potential emergency, you can push the button. You are reliable for
your judgement.
No one can give you the number of sickness = emergency stop.
Same logic, if a crowd is in a heated argument and might result in violence,
you can push the red button. It might end up in violence, it might not.
I cannot give you the number of heated argument = emergency stop.
First, who records the number of heated argument in a train?
Second, who draws the line of a "heated argument"?
Third, a heated argument might or might not result in a red button. It is
the passenger's option to draw the line at that point.
In this case, is there any abuse of the red button? Who draws the line? You?
Me? I would say the authority.
This will be the only time I am responding because your comment has
fundamental logical flaw. And honestly, I cannot care less about the comment
of Mr. Kong.
If you are that interested in the abuse of emergency stop in HK trains, you
can call up the authority to get real data OR .... haha.