Head of State immunity reduces the deterrent effect of international criminal law  International criminal law, like any other form of criminal law, is supposed to be a deterrent. By giving a class of individuals impunity, these people cannot be deterred by International Criminal Law from committing some of the worst crimes known to humanity, including genocide. It is plain that many people who reach the heights of political power will use any method to remain in power – thus the resort to intimidation where it can be used to affect the vote, or in the case of Silvio Berlusconi the attempt to put in place an immunity law to prevent himself from being prosecuted for corruption. [1] Immunity will enable both large and small criminal acts, neither of which should be allowed.  [1] Kennedy, Duncan, ‘Berlusconi immunity law overruled’, BBC News, 8 October 2009,