Agree wholeheartedly...there have been too many polls lately which are irrelevent to anyone outside the US.
So... Scotland, Ireland, France, and Canada are part of the US now? Interesting. And non-Americans say we don't know geography.
Like all American "Traditions", Trick or Treat is a bastardised version of something else, an amalgam of traditions from various place lumped in to one homogenised whole. Most of those traditions come from Gaelic parts of the UK - thats would be most (but not all) of Scotland, Ireland, and Wales - those from the non-Gealic areas wouldn't know about the origins of the practice, and would therefore regard the whole thing, along with its implied threat of violence should the householders not wish to take part, as yet one more American import.
Thank God we don't have any smart terrorists... the kind who would, say, cause a security alert at an airport in order to have it evacuated and then set off the car-bomb parked outside (away from all the security, checks, police officers with guns, etc.), in the open-air, right where 10,000 people just got evacuated to.
There was a terrorist attack in Manchester several years ago by one version of the IRA - several small bombs were placed on shops in the Arndale Centre (later to be all but demolished by another bomb). When these bombs went off, the entire building was evacuated - it was later found that explosives had been laid by one of the main emergency exit routes. IIRC, these explosives didnt go off, but the loss of life among those trying to get away from a smaller event could have been staggering. Then again, this was something the IRA was adept at - after all, what better way to cause terror than by making it obvious you might be killed even if you get away from a terrorist incident.