I disagree.
The ref can be "blamed" for failing to act in accordance with the Law, which MIGHT have prevented the action of DG.
Ferris can be "blamed" for the initial illegal act.
DG can be "blamed" for taking the law into his own hands.
The ref is responsible for his inaction. Ferris is responsible for his actions and DG is responsible for his action. But the three are connected.
The question is - should one be allowed to shift the balme for their actions onto another? I say no. It might help to explain their actions, but it does not mitigate their actions.
(Andy example - Child Services can be blamed for failing to take action, but they can't be blamed for the death)
Just because 1 person takes the balme for their own actions, doesn't mean that otehrs who were invovled should not take some responsibilty for their own failings (ref should be responsible for not PK the first infringement, Ferris for not releasing etc). It does not excuse the actions of those who acted as a result of these though. That is their look out (i.e. DG is responsible for his own actions)