Should companies that ban Christmas decorations encourage Halloween decorations?

Maybe one has nothing to do with the other. It does seem odd, however, to see so much jubilation in the office about spooky and silly masquerades (I am already thinking on my costume for this year) as the holiday season kicks off, only to have that heightened level of folly followed by sanctions related to the celebration of religious holidays, and in our offices, that is specifically Christmas. No Christmas trees, no baby Jesus, no hint of Christ at all.