Why Wasn't That RoofTop Covered By Secret Service? Cops Were Warned by People!

Thing appear to add up to the Secret Service let this shooting happen! The protective Secret Service snipers let 42 seconds pass after the gunshots before they shoot him to stop him. Bystanders saw the assassin crawling up with a gun and pointed to him to the police and secret service. That never shold have happened, No way...
A ladder was set up for him to climb up. A ladder! Should never have been there, not with the Secret Service Protection. ALL Rooftops should have had Secret Service Protection on them! Of course. That is Secret Service 101!!

I am not a Trump or Biden Supporter but it is an Act of God that saved his life.