People shouted ‘jump’ before suicidal man fell to his death
http://metro.co.uk/2015/03/16/people-shouted-jump-before-suicidal-man-fell-to-his-death-5106465/?ito=v-b
A suicidal man died when he fell from a building after people shouted ‘get on with it’ and ‘jump’ while police tried to coax him back from the edge.Some people even filmed the victim, aged in his 40s, as he fell to the floor on Saturday afternoon and one person was heard asking ‘how far can you bounce?’Police were called to the scene in Telford, West Midlands, and have since criticised those who shouted to the man.
Inspector Ben Smith said: ‘It is pretty appalling because it is someone who is clearly in need of support and assistance. That behaviour is something we would condemn.‘Clearly what that individual needed was time and space and a professional to help them out.
The individual would have been in need of care and support and appropriate intervention from medical professionals, so anything like that to encourage someone to jump should be unequivocally condemned.’
Kelly-Anne Taylor, 35, from Telford, said: ‘People were recording it with their phones and yelling at him to jump.
I can’t stop thinking about it. I was up town when it was happening and how much I wish I could have tried to help him.’

I do not see what the offense is here. The universe is indifferent to your being, and people have no obligation or duty to be sympathetic your being either.
It is very likely strangers to the "jumper" viewed the individual as annoyingly occupying time &/or space. At best believing the stunt to be overly dramatic and insultingly selfish, or at worst viewing the individual as mentally ill.

In either view there is no object reason a passerby need feel or discourage others from their self harming mania.
Morality is made up. It's not a real objective thing in the universe. There is no right or wrong- there are laws and social norms, both of which are transitory and relative.

Outrage is unnecessary save where it infringes on another person's safety or relative freedom.

When someone is in an unstable state shouting at them, let alone advising them to kill themselves could definitely be considered infringing on their safety.

Your safety is what I clearly am talking about above. It is not necessary to be outraged people are jumping off buildings as long as it is not effecting those walking by or the infrastructure one maneuvers within.
Which jumping off buildings does effect, naturally. However it is that which should outrage an individual- that it inconvenience your day and probably cost some money to clean up.

Outrage because one may think some passerby is an "asshole" is foolish. Outrage out of some "moral" stance is unnecessary.

I wonder if you'd say the same thing if it was one of your loved ones being encouraged by apathetic strangers to kill themselves.

I would
The state of the loved one is important to me, but I do not believe others have a duty or obligation to be sympathetic to my loved ones or my feelings toward a loved one.

Imagine a different scenario:
I come across a child with obviously diminished mental capacity holding a hand gun. I heckle the child telling it that it should put the gun in its mouth and pull the trigger. The child does.
Would you be outraged? Would the situation be so different?

At your heckling? No.
At the circumstances that lead to a person with diminished mental capacity having a firearm, probably so. Because it is not in the best interest of myself, and society in general, to have firearms so accessible.
You would be a jerk, sure. The heckling is not where I would say valid outrage should be directed, however.