Fallout 3 may be one of the few games where you can be legitimately evil, to the point where you might as well be the villain.

1. You can murder your way out of the Vault (Mostly excusable as self defence...except when you execute the unarmed Overseer who is essentially your prisoner at the time)

2. You can nuke a town full of innocent civilians, including children, for money and an apartment.

3. You can join a group of slavers and then go around enslaving people for money. (As well as using said slaves for combat)

4. You can enslave children, but they cannot be used in combat...still though...

5. You can go out of your way to kill a vault full of innocent people...like REALLY out of your way.

6. You can kill a sentient tree, therefore preventing new plants from growing in the wasteland.

7. You can ally with the robotic president of The Enclave and poison the water supply of the river (A move that The Enclave themselves think is pretty evil...and they're THE VILLAINS)

8. You can send in one of your followers to turn on the water purifier (Or poisoner) in place of yourself, thus getting them killed.

9. You can (In the epilogue DLC) fire a nuke at The Citadel, the HQ of The Brotherhood of Steel, killing untold numbers of people as well as all of their leadership.

10. You can kill and eat your dog.

So...tell me a game that trumps THAT shit.