The Trolley Problem, in Theory, and in the Real World

View the following YouTube videos regarding trolley dilemmas:
After watching the video(s), address the following questions:

How would you respond to each of the five variants of the Trolley Problem described? Be thorough and justify your reasoning. For each scenario, think about whether or not the answers to the following two questions differ: What is the right thing to do, and what would you do? In each of these cases 1-4, the result will be the death of one person and saving the lives of five people.
Variants of the Trolly Problem
Original problem – you are the trolley driver; the decision is to pull switch or not.
Fat man variant – you are an observer on a bridge; the decision is to push fat man or not.
Fat man/villain variant – you are an observer on a bridge; the decision is to push fat man or not; fat man is the villain who put the five people in danger on the tracks.
Loved one variant – you are the trolley driver; the decision is to pull the switch or not; the one person that would die if you pull the switch is a dear loved one of yours (parent, child, spouse, etc.)
Man sleeping in his yard variant – you can divert trolley’s path by colliding another trolley into it, but if you do, both will be derailed and go down a hill, and into a yard where a man is sleeping in a hammock. He would be killed.
What if instead of killing one person to save five, your action would result in killing four people to save five? Would you change your behavior in any of the situations? Why or why not?
Transplant variant – This version addresses some of the same core issues as the Trolley Problem but with the following scenario: A brilliant transplant surgeon has five patients, each in need of a different organ, each of whom will die without that organ. Unfortunately, there are no organs available to perform any of these five transplant operations