I see both sides of the coin I think. I completely understand that people about to commit suicide are not necessarily thinking of the other passengers or train driver. Considering the distress drivers then have, I think it is selfish on that level. However they're hardly in the right frame of mind so I do feel sorry for them. And their families of course.
I also feel for the poor drivers. Terrible thing to experience.
That said, I don't believe that anyone who moans about delays in these circumstances are unreasonable, unsympathetic etc. As humans we tend to put our needs first, which is ok.
I've been in trains that have been delayed (not for jumpers, for trespassers on the line and for other trains in front going slowly). In many cases 10mins late can be serious.
Being delayed by hours isn't a problem if you're only going to your friends or the city for some shopping. I imagine that isn't true for everyone. Many people (me included) have probably had to run between platforms lugging suitcases and all sorts, getting caught in delays - - stupid slow dawdlers on escalators - - in order to catch their connection to work, or an important meeting.
And it's a good idea to book trains with a longer period in between connections to allow for delays. That's fine for 10mins. What if you're stuck on a train for hours? The stress that'd cause let alone the impression you're giving interviewers.
I was on a train the other night coming home. It should have been a 20min journey and took 2hes to get there due to police incidents and trespassers. I then got home and missed the last bus home. So had to get a taxi at 11pm. Then back in work for 8am
So I can quite easily understand how frustrated other passengers can become. I think it's understandable. Especially if you're in a city where it happens regularly. You can't cry every time it happens or your MH would be seriously affected. I imagine in bigger cities it's something people have to get used to. Acting in an offhand Manner might well be a defence mechanism.
To everyone saying they think moaning is disgraceful. I wonder if you'd feel the same if it meant you were half hour late to an important interview, if you missed your flight, if you missed the birth of your child, if you missed a school play, if it took you 4hrs to get home, if you missed an important meeting, if you were awfully late to work etc.
Doing this is selfish. It's selfish to a small extent to all the passengers having their life disrupted for potentially hours on end and certainly to the poor driver. Anyone doing this is likely mentally ill so Its not a conscious choice for them, but it is a selfish act all the same