You can find token examples of Americans who think that Harry Potter tricks children into being Satanists. You can find Americans who think that Schindlers List is jewish propaganda. You can find Americans who believe that Brokeback Mountain should be banned under obscenity laws.

These are fringe beliefs. As a general rule, movie studios do not shitcan movies just because a couple of dumbasses think that the movie goes too far.

Seriously, if Harry Potter was released despite the controversy it caused, there is no way in hell that "controversy" around The Interview is the reason behind this decision. You'd have to be incredibly out of touch with American society to think otherwise.