WH and SS:
Security is about having a layered defense and not one thing alone. As we analyze the WH correspondence assassination attempt, there were blaring security deficiencies on coverage. Only one cops drew his weapon and was facing the proper direction of the attacker, although he did point his gun, he neither fired nor obstructed the shooters pathway, thus allowing him to get further towards his goals. Why would a cop take down a metal detector, causing a diversion of attention, when the event hadn't even started, should be a red flag.
Even if it was necessary for whatever lame reason, there should be coverage planned beforehand of ingress pathways or vulnerabilities that such actions might trigger. All directions and times must be covered: 7D x 3T is what stopped the golf course attempt. ThankQ for your attention to this matter.