Would I? I don't know. I can't judge my behavior in such a situation, as I have never been in one, and my life experience is not helpful here. I would jump if I had the willpower. Because it seems reasonable and right to me.
And someone would punch the prankster in the face beforehand, for tripping the old man. Automatically, under the influence of emotions. And he wouldn't think about how he looks in the eyes of others. And he wouldn't feel bad about it afterwards, he would help the old man up and walk away. And his self-esteem wouldn't suffer.
Homeless people, foresters, explorers - you overestimate the importance of the human factor. You can choose any sociophobic recluse, who doesn't like people or society, as the most banal example. He would definitely choose the second option in the poll, without thinking for a second.
I wouldn't be able to handle the third one.
Even if we ignore all the lofty feelings, there remains sex, which is fundamentally necessary for an adult. No, I'm not that far from animals in this regard.
A person does not live only by instincts, at least I believe in it.
And I - do not believe that one of the arguments for suicide is the subsequent inability to satisfy oneself. This is so absurd that it cannot be considered an argument.
Dying is not pleasant, especially in the ways you described. And is it pleasant to stay alive when your parents, children, close and loved ones have died?
In words, everyone is Leo Tolstoy, but when it comes to action, at one fine moment, all the imaginary family ties or the imposed social stereotype of love will disappear, and only fear will remain. Such a close and real fear of death. And this is not a shameful fear. No books about brave fantasy heroes jumping into a dragon's mouth will eradicate it.
P.S.
If the instinct of self-preservation could not be suppressed, there would be no wars - soldiers would run away as soon as they saw each other.