I think "we dont buy into it" is more appropriate wording than 'believe' in this situation. Seems that in this country some people want to do it and are right into it...and some really dont. I do get a laugh out of people who are soo bothered by one night of children knocking on their doors, but I guess everyone has their reasons.
Personally, we let DS dress up and go Trick or Treating. He knows that some people dont do it so dont have candy, so he doesnt get upset if he gets a few (or alot) of knock backs. We always buy candy and hand it out to kids that are in costume