US has not (yet) banned the use of the class of pesticides known as neonics. Europe has banned neonics in an attempt to save bees from Colony Collapse Disorder (CCD).
CCD is reversing (improving) in the US.
CCD is increasing (worsening) in Europe.
The apparent cause (that needs research and validation, not just anecdotes) is: Neonics work as designed... At levels found even on drastically over-sprayed crops, this pesticide does not harm bees. You would have to intentionally concentrate and force-feed the neonics to bees to kill them.
Because neonics are banned in Europe, farmers must use more broad spectrum pesticides, which are more harmful to bees, but less harmful to the intended pests.
With increased pests there are fewer flowering crops available for the bees to feed on.
Thus, with less food and more poison, CCD continues in Europe, directly contrary to their intentions.
Lesson: If you're going to be an environmentalist, work within the realm of reality. The easiest way to align your beliefs with reality is to do the damned science!