Superman Theory

In "Crime and Punishment," the main character wrote an article that argues certain individuals also known as superman have justifiable reasoning to kill one person in order to benefit the lives of many others.  What is one life in exchange for the lives of hundreds, or thousands or even millions?  Is the sacrifice of one that astounding especially if the life of that one is not worth keeping because that one is a low life scoundrel that preys on the lives of others?  If you can save the world by killing off the villian then wouldn't you make that sacrifice? 

Lubbu~