I realize that Halloween is a commercial event, but I think there are other outlets for criticism of capitalism. Things where you can make a difference and at the same time let the children have fun. I don’t think you can change much if you dwell on trivialities that bring people together despite all the commerce. That doesn’t seem to me to be the right approach.
What do you mean by religion? Halloween is a pagan festival according to Christian standards. Of course, I’d be right there with you when it comes to the fun festivals of pagans, but is that what you mean?