These people know better. They learned proper procedures in school and know this is wrong. So there is NO question these acts are a result of the attitude of those in charge. Crap flows downhill and the top turd needs to be flushed! And a lot of thers who were in a position to intervene, then a whole new culture needs to be created and every capable worker retrained and tested for conformance.
This is how a swamp-draining is done.
That they knew better is evidenced by the fact that they tried to cover it up.