Its pretty obvious that if the US president did not have the amount of security he does cushioning him from the consequences of the decisions he makes then he’d be a great deal more cautious when it comes to the decisions he makes. Same comes for the British Prime Minister & many other heads of state. But its with the US president where the issue of security always seems a bigger deal & of course it’s US presidents (past & present) who embroil the US military in wars around the globe which have cost the US taxpayer far more then the direct cost of the US presidents security entourage.