If a Boeing engineer has a breakdown and robs a 7-11, the C suite of Boeing is not responsible for that.

If the Boeing engineer murders people in their course of duty because of the incentive structure set up by the C suite then they are responsible for that. How do you prove that? The same way how you prove anything. Lots of discovery which reveals concrete evidence of the C suite setting up and maintaining said incentive structure and then the prosecutorial team describing the connection to a jurry of their peers.

It is the difference between little Jimmy deciding to rob a 7-11 because they are dumb as a rock, vs doing the same because they grown up in an organised crime family.