1. Religious fanatics and the leaders of the churches/other religious leaders. All of them.
2. Murderers and serious, violent criminals. Put them together somewhere, let them kill each other, then finish the remaing quickly.
3. The assholes from the entertainment business. They can be stupid, good-for-nothing celebs, annoying people from TV and so on. Close them together and let them "entertain" each other...
4. Jack Thompson and all the other fucking idiots blaming everything that is wrong in the world on games.
5. Bush and the real leaders behind him and the same with other big, powerful countries. Execute them slowly, in a very painful way.