Someone did sufficient research to find that the actual origins of the word "Sioux" actually means snake in some obscure tongue from the Canadian frontier. So, now the formerly Sioux people in my state want all the things named "Sioux" (including my city) erased. It became offensive because some jerk dug far enough to find a reference.
Well, Haloween surely was a pagan holiday, but it's not now. Right now it's just a fun excuse for kids to dress up. There's absolutely nothing wrong with it.
Ask the average Joe what's in the Constitution of the United States - - same response...