Well I didn't answer the door last night. Just sat eating my pizza and watching a film.
What's the problem with that? Well my wife had taken our kids out with some others, trick or treatin'
Hypocritical I know.

I'm a bad bad man.
In my defense, when I'd finished my pizza I did start to answer the door

(There were only 4 trick or treaters all night anyway).
The first one I answered the door to was a girl about my daughters age on her own (her dad was at the end of the path), so I offered her the sweet tin and she took one with a "Thankyou very much".
So I said "Go on, take loads", and she only took a couple more, bless. She was so polite and sweet it did make me feel a bit guilty for not opening the door earlier to the 3 others though...but I
was cooking / eating
When my wife came back, the kids had plenty of sweets. She said she'd seen loads of trick or treaters down the road, but I said only a couple of them had been near us and our street was deserted.
I think the problem is the lack of community spirit (yes I know that's hypocritical considering my earlier stance). I mean the lack of community spirit in general. How many of us know the names of our neighbours, let alone are likely to organise a big trick or treating event with them?
I don't think anyone's that fussed any more either. Some regard it as begging, but if done properly, it's not begging at all.
The idea is that children get dressed up and scare people into giving them treats. Harmless, mock scaring and just fun. Think of the phrase "Trick or treat". It's a choice...
You may say it's demanding goods with menaces or begging but so is charities knocking on your door....or companies cold calling.
When you look at it properly, its a community spirited event based around the kids playing pretend at being scary.
If it was a more established practise within a whole community like it is in the US, and not the half-arsed version it is here....then there would be more codes of practise like you see in villages.
Those who welcome trick or treaters have a pumpkin in the window, or maybe leave a porch light on, so the families and children know.