That's because in the US every punk gets his pro card sticked in his ass at the Nationals and USAs. In Europe its much harder to get a pro card. Ten out of the 12 shitty pros the US produces a year who wouldn't even stand the slightest chance at the Amateur world championships, where the Europeans have to make it to the finals to get a pro card.
They have been saying this for years, ever since Dorian took the Olympia, hasn't really happened...yet. You may have one or two that come up, remember the hype that was Alex Ferderov? Well, once you start looking at the physique it wasn't much. Wolf is good, but only time will tell. The US has a bigger gene pool that get into bodybuilding, due to our genetic diversity, than Europe does,and this has been said by bbers on both sides of the Atlantic, so you actually see the better physiques (initially) over here, and that is the key word, "initial", they eventually screw it up with the insulin and the HGH.
I think a lot of people still remember the days of the East European block and former Russian states and their Olympic drug experiments, and beleive that they are still as sneaky, like they have some sort of secret bbing weapon...and Alex Ferderov was suppose to be it