Well, now it has been discovered that the teacher that proped the door open removed the rock, but when the door was shut, it didn't automatically lock itself.
Every day, more is learned, that circumstances were not always as they appeared.
Thus it's always better to wait until a through investigation is completed.
https://www.foxnews.com/us/texas-school-shooting-lawyer-says-teacher-closed-door-gunman-entered-propping-open
That was known 2 or 3 days ago.
Outside doors are metal at schools and they are heavy, so if the door slammed hard it can rebound before the latch can catch.
Speaking of doors, nearly all classroom doors are heavy wood which open out with hinges on the outside which of course is immaterial.
The Texas DPS showed a diagram of the punks path showing the inside wall. The rooms were along a long flat wall.
In many older schools and maybe newer, the walls were made from concrete blocks.
Blocks combined with heavy doors (the hinges are probably tamper proof or difficult) make the classroom hard to breach.
Unless you have a key.
A simple plan would be to divide forces with half on each side.
A cop could have tied a rope or extension cord to the door handle and tossed it to a cop on the hinge side.
Then, a cop could have taken a key (every custodian, staff member, and teacher had a key) worked up a good slobber to wet the key to quieten it and unlocked the door and the cop across from him could have yanked it open.
the cops would have their backs against the wall making hard targets.
It would also be smart to have the first cop on each side on his knees shooting up.
This, IMO would have worked and saved the lives of CHILDREN.
No, I don't hate cops, I know most of ours, three of them very well.
But I was the victim of a deputy sheriff and a crooked judge in 1987.
So I look askance at cops in certain circumstances such as Uvalde.