Super-spies, On Killing
If you ever have aspirations to rule the world, blow up national monuments, or merely take revenge on the people who bullied you in the first grade using a nuclear powered super-laser from the moon, then you will probably have to deal with a super-spy. The key, of course to killing any super-spy is to shoot him(or her) in the head and throw the corpse into a furnace. That's it. All super-spies are arrogant asses, and at some point you will capture them, and that is when you end it. Now you might be tempted to keep them alive for interrogation, torture, or as some sort of bargaining chip, but the fact is that torture does not work and every second a spy is alive is a second that you are in danger, so end it.