It’s easy to assume that both policy changes were driven by the mass shooting in Las Vegas in October 2017, when gunman Stephen Paddock hung a "Do Not Disturb" sign on his room door for several days, thus concealing the ammunition he had smuggled on property.
Certainly, Hilton’s new policy explicitly references this incident (Disney demurs). But according to lawyer Stephen Barth, who teaches at Houston’s Conrad N. Hilton College of Hotel and Restaurant Management, DND doorhangers have been under review by the industry for some time.
