The door being dysfuntional is one thing, the shooter being told is next level. I have not read anything about an accomplice who did that, if you have share.
However, the nearby roof was seen in advance and was left wide open as per a human decision, and the shooter knew to go there, was that incompetence I find it hard to believe, was there incompetence on that day yes that seems evident.
Dan Bongino worked for the Secret Service for years and did the advance work at events just like these. He said if you are not going to put someone on the roof then you get some balloons and put them up so they don't have a view of stage. Simple fix.
The director of the Secret Service said she thought it was unsafe to put people on that roof because of the slope despite having two teams of snipers on other roofs with the same slope. Instead she said she put a team in the building to secure it and yet they allowed this guy to go up onto the roof of a building they are securing, using a ladder on the outside of the building, he was up there for as much as 30 minutes, witnesses as well as the police were aware of him on the roof. So how is that "securing the building"?
There is much more to Uvalde than the police sitting outside for forty minutes while he shoots up the school despite that being contrary to police protocols, and also about the door being fixed so it could not be locked, or about him knowing which door to go into, or even about some poor guy working a part time job at a fast food restaurant having about $100k in equipment. Uvalde happens to also be where two eclipses intersected, the one in 2023 and the one in 2024. These kids were a human sacrifice to Satan.
Either you believe with your whole heart and mind in coincidences. or else you allow common sense to guide you. The odds that all these things just happened to be coincidence is less than 0.000001%