You and 41 other people are standing on the Golden Gate Bridge and one jumps off. You see him hit the water and come back up. He is not dead, yet.
Are you willing to jump off the bridge to ATTEMPT to save his life? Are you going to start demanding that the other 40 people jump off the bridge and attempt to save his life?
Keep in mind that on this particular day, all fire/police and rescue services are on strike and it's just you and the other 40 people. Do you kill yourself to save him? Doubtful.
This is the circumstance those 40 people were faced with. Superman only comes in the movies.
Sir Edmund Hillary sees it different than you. I think I will give him the benefit of the doubt being he is the one who made it to the top and back down first.