Hey, there's no problem is making a "call" here to determine the exact chain of events. The problem only arises with making criminal charges. Yeah, thrust reversers blowing crap off planes shouldn't happen. But it does, and most of the time, it doesn't bring aircraft down.
It's like being charged for manslaughter for leaving a microwave under the visiting hoop at the school gym after a church bake sale. There's a basketball game, and one of the spirit squad members waves a hotdog at the two-minute warning, and a man with a pacemaker has a heart attack. Instead of calling for help, he walks to the nearest payphone, dials 911, and dies before the ambulance gets there.
The fact that your son plays for the visiting team doesn't enter into it.
I don't want to read anti-americanism into this one, especially since the employer's nationality doesn't determine that of the employees (see for example the CDG THY DC-10 ramp rat failure a few decades back, where the Algerian baggage loader was incapable of reading english or french, and thus failed to shut the cargo door properly, causing a complete loss of aircraft and passengers, with blame apportioned -- and rightly in that case -- to the american MD engineers; there, the employer was Turkish, but the employees were French citizens)