It probably because many people find it wise to choose what hill they want to die on. Besides being a massive amount of over thinking why someone would like the hat, it is incorrect. There are now a large number of guests who have never seen DHS any other way. I don't think that they are ignoring everything around it, in fact, they probably appreciate it more then we do because they have seen it no other way. As far as giving approval to those complacent in allowing it to happen, well, I guess they either, 1) weren't aware that they were supposed to get all about a stupid hat in a theme park, or 2) if it bothered them, didn't figure it to be worthy of a lot of concern.