tbf i feel a bit for him. it's clear he isn't a bad dude and was decently educated, he lost his tamper (which is a no-no if you want to be a pro pilot, you are supposed to handle well pressure and anger issues) and we all were at least once in those situations where you want to sabotage the shit out of someone who wronged you. he most likely deserved it, but it's true some pilot instructors are absolute pieces of shit. he ruined his life because of lack of self control and it's a bit sad. he's not a criminal or a sadist, just someone who reee'd the wrong way.
France