The perimeter was to small. Deliberately? Thats a question of whether it was resource limited or incompetence or intensional by the team on the ground. I have little doubt higher ups withheld resources. In that case, the team on the ground does the best it can with what it has. The roof top was covered from the SS sniper position. Should it also have been physically secured? That will be a hot wash topic.
Why was a obvious sniper postion, 150 years from one of the world top 10 high value targets, with ladder access left uncovered and unguarded?
At a bare minimum the Secret Service would have a uniform watching standing in front of it if this had been a Democrat speaker.
So all the postruing and blame shift is designed to ofuscate this point. Secret Service ownes the site. What every resources, state, local, federal they use does not matter. They are wholly responsible for security here.