Stone cold murder.

[Clang McFly]

You are allowed to kill up to 10 people with out it coming back to you in any way. You don't have to do it yourself. Hit a button and poof gone. No one knows it was you. Or you can bash them with a hammer set them on fire. Up to you. How many people are you going to kill and why?

Only 10? With the exception of my family and friends(Mock/TK, work and others), kill the rest of the world, watch it burn.