Keep in mind that there are more whites with IQs of 120 or more in the US than there are Jews period. 

But really it's because whites (especially northern Europeans) are gullible, individualistic, cowardly, socially impressionable, and mentally dull. They may be intelligent in some areas but they have some seriously unevolved and under developed social organization skills. Years of extreme wealth have also made them soft, lazy, and trusting. 

Jews on the other hand have been naturally selected to become a perfect hive-mind parasite swarm.

Euros are docile when not being lead to war, Jews are vicious and cowardly parasites who are always on war footing.

Jews use ultra-capitalism to divide and conquer the goyim on an individual level, if whites ever embraced collectivism again like they did during the Third Reich or Roman empire, they would once again dominate the world.