it is the immigrants. not because they don't partake, but the low trust society they create. sense of community has been totally destroyed by immigration. immigration isn't the only factor but is the main factor. the next major factor is economic. less people are homeowners, and even if they are, chances are they moved from their native town/city to find a job good enough enough to become a homeowner. this lowers the ownership stake people have in society, leading it to being treated like a rental. low birthrates also lead to low ownership stake. anything that reduces ownership stake will reduce sense of community.  plus, halloween is a dark holiday to begin with, a celebration of the dark and occult. even when america was still high-trust, there was a sense of distrust on halloween. the whole "someone might put a razorblade in your candy" thing. i'm sure i'm not the only one who grew up with parents who wanted to check the candy for tampering before allowing me to eat it. this only gets magnified when society is low trust to begin with.
United States