ALL security equipment was "turned off" shortly before the event for "upgrades."
The owner of the security company under contract? Marvin Bush.
Access, and capability is answered.
The questions left are 'exactly' who and why, and the minor timeline details of when.
Certainly, of what we already know, the possibility remains clearly open for a controlled demolition with respect to access and means.
You must be new here. This is old hat stuff.