There is a BIG difference between bodyguards/security gaurds.. even law inforcement and the secret service and thoughs who surround the president..
The Secret Service is SO large, so incredibly trained, and increadably untouchable..
The dueties of Secret Service..
* Protect the president, vice president, there spouces, there children and grandchildren untill the age of 16.. (this includes every X president)
* Invesitgates U.S. counterfits
* Investigates in financial fraud
* Forensic investigation
* Assists to protect foreign embassies
* The U.S. Naval Observitory
* And the White House
* Many other dueties that cannot be released due to security reasons..
ALSO the same people that protect and serve our country such as every branch of the military, NSA, FBI, CIA etc.. All take part in protecting not only Us citizens but highly personal to the president.. From tapping phones, interfearing secret intellegence. etc..
I mean do I really have to continue??
Just to give a little idea of how protected the president is.. He has U.S. Marines fill up gass in 'Air Force One', the presidents personal plane.. And the cars he always driven in is filled by secret service.
NOTHING goes un protected.. Just because you might not SEE people around him at ALL times does not mean no one is watching.. THAT's part of the point, a large majority of the security's job is to be UN SEEN..