Umm...I don't know....
The Answer is Ponies?
Or it could be our insidious plot to take over the world through Halloween and forcing all the Gentile Kids get pay homage to Baal and Asherah!
You should see we they do over in Sweden on Walpurgis Night.
I still say HaShem had it right to begin with, and inventing new holidays (or religions) was never called for.
I'm quite sure the Ponies actually celebrate Purim!
If we can celebrate the Jewish Holiday of Baseball, I have no problem with Jews celebrating Halloween or Christmas.
In any case I suspect God is OK with anything that brings us together.