The 'drunk and loud' person may also falling off a platform or attempting to board a moving train and is, in my view, a higher risk, and is also more likely be involved in violence. There has been at least one instance of a drunk person on a station being killed by a train in recent years, but I can't remember ever hearing of a 'spotter trespassing' being involved in a similar incident.
I'm not saying trespass is right, but should someone who is slightly the wrong side of the boundary fence be the biggest worry? Surely any action needs to be better targeted. How did anyone survive in days gone by when things like
this were commonplace!