I took several philosophy courses in college, and questions like this always irritated me. No matter how you answer you're funneled into a particular school of thought, and then the smarmy bastards (otherwise known as philosophy professors) extrapolate from there and pigeonhole you as a this or a that kind of thinker. It's absurd. People don't behave rationally most of the time, we behave according to conditioning, or make quick assessments of a situation and then still behave according to conditioning, and then analyze it (rationalize it) later and call it philosophy.
Think about what happens over the course of a few weeks or months as philosophers discuss these kind of things in journals: one philosopher finds a way out of the scenario, so another refines the scenario, closing that loophole, and this goes back and forth until the scenario is that your hand is taped and chained to a stand, the gun is placed in your immobilized hand where the only part you can move is your triggerfinger, and the terrorists or whatever parade all the hostages in front of the gun until you shoot one. You have no option to try to escape, no option to shoot yourself, no option but to kill one or watch them all die, and then yourself. The whole point of it is to create a situation that embodies some abstract philiosophical divergence and then make you choose. It's sometimes an interesting insight into yourself, but more often it's just a silly exercise that serves no broader purpose than to teach what the different schools of thought entail.
Even though it's taken as a tongue-in-cheek kind of witticism, I don't think it was too far off the mark when Alfred North Whitehead said, "The safest general characterization of the European philosophical tradition is that it consists of a series of footnotes to Plato." Socrates (through the writings of Plato) said over and over again that morality is not concrete and quantifiable, so we should be humble and exercise caution when making moral decisions, especially when those decisions will affect others.
What I'm getting at is that decision-making of this sort is determined more by who you are than by what you think. It comes back to the classic spiritual precept we've all heard before: the best thing you can do for the world and anyone in it is work on yourself.
K