“Trick or treating is a conservative principle to the core. They come to my door in costume to entertain me and I reward them with a treat. They perform work and then they get pay. “
What if they don’t entertain you and you don’t give them a treat? Then you get a trick.
Then I deserve the trick as I had an implied contract with them by turning on my porch light. They have fulfilled their end when they rang the bell and said "trick or treat" as their acceptance of my offer.
If you don't want to participate, just leave your light off for a couple of hours. The key difference is that this exchange is voluntary unlike me being forced to buy your neighbor's obamaphone and groceries, pay their rent, and pay for their healthcare.