WE don't have the good samaritan law in the UK, which back to the other thread I refered to lots, LOTS of people said we don't need it in the UK because we'll all jump in and help without the threat of being sued and laughed that America needed that law, the anti american idiots on here astound me to be honest. Anyway lots of countries have their own take on the good samaritan law except the UK last I checked.
But in regards to giving CPR, lots of people simply don't know how to do it correctly and 95% of people would do more harm than good trying to help. But again its that thing of, i "think" i might be able to help but If i step up, maybe someone who really knows how to do CPR will walk past, think its covered and get on with his own busy day.
Then theres, even if you do know CPR, if you help and still fail, the guy dies, you feel responsible for failing, while if you don't try you don't fail. Taking responsibility for another persons life is a fairly big thing, it should be a fairly easy choice but theres lots and lots of factors to take into consideration.
The other thing would be, in a airport I'd be less likely to jump right in that in the middle of nowhere, as I might be the guy in the middle of nowheres best chance, while in an airport there should be medical personel and multiple trained first AID people like security and police around something like an Airport.
Sorry for your loss anyway, sudden out of the blue things like that are the hardest to deal with, even more so when you feel so far away from someone.
Not sure if it will help you or not, but most people who don't know CPR(and its most) will end up doing chest compressions that are far to weak to help, in the wrong position and not securing the airway and blowing air into the stomach rather than the lungs. I guess the argument is less would he have survived if anyone helped, but would he have survived if worldwide people are taught CPR in school with refresher courses run at most business's every 5 years for life and the likelyhood of something like that happening around someone who knows how to do proper CPR goes up dramatically.