There is no substantial evidence that proves that the FKS is safer than any other binding out there. The only binding known to be safer is indeed the knee binding.
When he said "not the right binding for you", I am assuming that he was talking about the din being too high. Which it might be for the 14, and there is a 95% chance it is for the 18's.
There is no such thing as a park specific binding, and FKS were originally a race binding. Also they definitely are not the best for park, due to the fact that when you snap the brakes, a new set of brakes cost around $125. That amount of money is no good when landing switch often, because breaks will be broken.
I don't understand why you are so angry, plus you are wrong.
Out of those bindings OP I would suggest the Deadbolts. But also look at the STH2 13 and the Attack 13.