Good question. Nothing adds up!!
Well I can see them sleeping and watching movies when you look at the time lines ....and the fact... it was while they were watching movies they noted his backpack......plus they were students so likely drinking as well which would account for the one kid sleeping if he had too much or low tolerance.
These guys didn’t have much grey matter beween the ears in the first place as school transcripts reveal failing. Not to mention even American students make ridiculously stupid judgements in college.
My brother made a pipe bomb many years ago when he was in college...set it off in the back yard...a science/math major he wanted to track it for a school project.
Neighbors called the police...they came to house and simply told him not to do it again. But then that was many years ago too. Still it was a ‘stupid thing’ to be messing with the stuff in the first place.