It has planed a lot of nasty dictatorships in Europe in the previous cold war. <-- That is my own reason of distrust. A fine country it is but it has the tendency to spawn McCarthies and Kissingers when cornered.

But for the sake of the argument let's say that it has done nothing wrong ever. This does not mean that we should be caught with our pants down if attacked (or if our western ally fails). Next time the US and (Insert superpower here) decide to divide Europe I wanna be able to tell em to stuff it where the sun don't shine