More like incompetence from them - guy clearly acting suspicious even when interacted with the some of the police personally, which the movie also emphasizes how suspicious his body language was and they still missed. There was no expectation of perfect decisions of course, but the decisions were too ridiculous knowing that all staff knows they should be on high alert. Right, human behavior, not FBI behavior.
Yeah I was talking about after they have found the guy in the basement, there were a few minutes of just her looking at the door.
Just really bad and lazy writing imo.