Philosophical & Personal Debate
To save your own life or the life of your family – family measurable in that specific degree that they have a very personal influence on you and in your life. Yes, there would be no issue.
I believe it is ethical to kill those who oppress, exploit, and cause suffering to others. Politicians, leaders of the World Trade Court, and some high ranking members of corporations deserve this kind of punishment. It is in the best interest of the common people to inform themselves of the issues in the world today and act upon those issues in an extreme manner to protect themselves and others. I highly recommend researching corporations such as Monsanto for a start.
Taking one person's life to save 100 others is logical, but emotions might keep us from otherwise making this decision. The further we can keep emotion from these decisions the better. Say the person you were going to kill was some random guy you don't know, and all you would have to do is press a button to kill him/her. This would be a whole lot easier if this person was, say your brother, mother, son, etc, and you would have to strangle them. The second situation involves a huge amount of emotion with most people that would otherwise keep them from making the logical choice.
I'm not saying emotions are bad, they just have their downsides. If it wasn't for emotions we'd be cold hard machines. Emotions are human (animals too) characteristics, and like all human characteristics, they have equal ups and equal downs.
But would it be ethical? Well keeping 100 mothers from crying is more ethical than keeping just 1 mother from crying. Not saving these lives because (in simple terms) "you don't have the balls" to make the necessary decision is selfish. You do not want to get your hands dirty, you do not want to have to go through this, so you are going to let 100 people die.
For me, it is both YES and No, It is ethical in a way that you save one’s life whether you kill someone or not. It is better to kill someone who cause suffering to others than to see someone who suffers from those kind of person. And I do believe that if somebody died or if somebody was killed, it is their fate that brings them to it; it is the end of their life line. And even though they already gone, only the body was died, but their soul reaches its perfection (it is according to the Philosophy of man of Socrates).
But, it is also not ethical in a way that “we don’t have any license to take somebody’s life.” Only God owned those rights to take one person’s life in order to save others who deserve to live more. No one has the right to kill others, and besides there’s another way to save lives.
I feel that if you choose to kill one to save many that your committing a crime but the amount of necessity can change the morality of the situation giving the killer of one the obligation to do so.