I will admit the investigation was biased towards information from the lower level, but I'm not aware if any of these people are, themselves, from the lower levels. I believe more investigation into them is warranted, to that end.

[ he's totally writing down all of these suggestions thanks ]

Provided we're able to locate and question their families without incriminating them, of course. Establishing more compassionate leadership among the upper echelon would benefit this society greatly.