What is the cheat code to kill citizens in Assassins Creed 2

I don't know if/how it can be done in Assassin's Creed 2, but in the first Assassin's Creed you can kill anyone without penalty after completing the game and replaying story mode. This site might make that a bit more understandable:

http://www.cheatcc.com/xbox360/assassinscreedcheatscodes.html