On the one hand, I'm sympathetic to Wal-Mart, Target, etc. setting up their seasonal displays around November 1. Most people decorate before the end of the month, so why stock random merch to replace it in a week, two at most? No problem with trees, ornaments, lights, decor, that sort of thing.
Where I draw the line is shopping centers putting up exterior decorations that early--or CVS having a display of Christmas candy meant to be given as a gift--or playing Christmas music in stores. (My best friend manages a major clothing retailer, he turned the music off Saturday night rather than force customers to listen to corporate's piped-in Christmas loop.) It seems there can be degrees--just because Target is selling trees, why do Publix and Walgreens feel they have to go 100% holiday mode?