This is certainly the attitude where we live. People told me it was "sinister", that I should beware of teenagers who terrorize the elderly, that it was just begging, a bad American import, etc.
On the radio some CofE clergy were saying it was satanic and likened it to "marijuana" saying "It's not as bad as the hard drugs but leads down that path" or somesuch nonsense. Maybe it's just me, but I'm thinking if there is a hell surely it's filled with Hitler/Stalin types and not pre-schoolers in duck costumes carrying plastic pumpkin buckets!
That said, the kids in our neighborhood were very eager to trick-or-treat. There was just nobody willing to give them candy. The second Halloween we were here we put up a big sign on our house saying "Trick-or-Treaters Welcome! Get Your E-Numbers Here!" Then we set up an assault course in our garden where kids could win treats. TONS of kids came. All were well behaved and said thank you. No teenagers terrorized us, but the ones who turned up in costumes were welcome to a sweet if they could tell me a riddle or joke I couldn't answer. My own kids thought it was good fun and they want to have it again this year.