Stupidity: Principal Fremont did not even consider the possibility that what Mr. Butler was saying about Lucas could be true. She basically laughed it off ("dismissed" it as absurd). On different occasions, Mr. Butler tried to tell her that he didn't think Lucas was who he pretended or appeared to be and that Lucas was blackmailing him for an 'A' in his English class. Because all of Lucas' grades from his previous school were 'A's, the Principal took for granted that they were legitimately earned despite Mr. Butler's concerns. A school Principal should be willing to at least look into Mr. Butler's accusations against Lucas, not merely blow them off as false. [The fact that Mr. Butler could not be more convincing is also problematic.].
Stupidity: Becca was presented as a good student (earned an 'A' in Mr. Butler's class) and intelligent person yet was easily fooled and influenced by Lucas to pursue her English teacher, Mr. Butler, romantically. Even after Becca (under direction from Lucas) went to talk to Mr. Butler after class, and she made Mr. Butler uncomfortable, she followed Lucas' advice to try again. After Mr. Butler made it clear to Becca that he was her teacher, she was a student (and child), and told her to leave, Becca still went along with Lucas' suggestion that she write Mr. Butler a letter/love note.
Stupidity: Lucas was called to the Principal's office a few times - including two times when a police detective was present - but his father was not contacted or asked to be present during questioning. The last time Lucas was in the office, he was told "You're expelled" and to go home. Even though Lucas drove a car to school, this is no reason to send him home without contacting his father (who was home at the time). Moreover, at least Mr. Butler was aware that Lucas' father was a criminal defense attorney. The school and the police detective should have handled the situation more professionally and done things "by the book" to avoid a lawsuit. [It is possible that Lucas was 18 and an adult, but even adults should have an attorney present.].
Stupidity: While Mr. Butler was upstairs taking a shower, Lucas goes into his house, kills his wife, and takes the baby to the school (into Mr. Butler's classroom). Lucas wanted to take away Mr. Butler's family, so all he needed to do was also kill the baby at the house (or leave the dead baby outside on the porch for Mr. Butler to panic while searching). Lucas could have left the house without getting caught for committing a double murder; instead, he keeps the baby alive and assumes Mr. Butler will know he took the baby to his classroom. (01:17:53)
Stupidity: In chemistry ("Greg's") class, Dylan teamed up with Alex so that he could cause an injury and be able to take his #1 spot on the chess team. The teacher tells the class they will be looking at alkaline metals under the microscope and to remember "alkaline metals are highly reactive, so proceed with caution." None of the students had goggles/ protective glasses, which are standard and required when doing such things in chemistry class. (00:14:55)
