How dare you ask that a parent be there to watch/pay attention to their kids
Say please if you want something. Say thank you if you get something whether you like it or not. If your kid can't say thank you, be there to say it with/for them.
If my kid is allergic to peanuts I'm not going to expect every household to stop giving candy with peanuts.
If my kid can't have gum or marshmallows because they have braces, I'm not going to tell people not to give those out. My child will be expected to say "thank you" and then obviously doesn't have to eat them.
Everything on that list can be handled with a parent to be there while Trick-or-Treating.