I realize this encompasses multiple issues; i.e., Halstead/Cox hiding for several minutes before calling 911 is not by any means the entire reason for the high death count. That was mostly achieved by several shooters arriving calmly with the other gingerbread fathers, unnoticed, i.e. lax visitor policies, which are totally understandable under the circumstances.

In fact, isn't it possible to suggest that the entire reason for choosing 12/14 was foreknowledge of the gingerbread event and the ensuing laxness that would be expected as far as visitors that day?