Oh, good grief! Maybe because when they tried the doors, they couldn’t open them? CHAINED doors would be evident, even from the outside.
How do you know any police tried to open the doors? Where did this information come from?
It's obvious no police tried to open the doors since no police:
Only faculty and students were injured/killed.
The police all waited outside, apparently. No one wanted to get close to this guy.
I'm not a police-hater or anything, but this appears to be a simple fact.
How many police approached this guy in the five hours between 7:15 and around 12:20 or 12:30 when he killed himself?
Zero.
Ziltch.
Zip.
Notta.
It's a darn good thing the shooter killed himself because who knows what else might have happened had he not.
Ishmael X?????????