I still don't get it.

Security didn't notice their suspect walking until at least several minutes had elapsed? Or else, they couldn't simply call after the suspect? The security videos weren't aware?

If security didn't call after or chase, how was the suspect to know to return? And if they did call after or chase, how come the suspect wasn't stopped or followed?

No matter what happened, it sounded like security failed, and in a heavy-handed, even punitive-appearing manner, to make up for that failure thousands were inconvenienced.

Will they now take credit for having averted disaster? And if they never found either their suspect or the contraband, how do they know whether it's safe to re-open the concourses?