I understand your point, but it is not comparable to this situation. Firing a person is a lawful activity; releasing a video in this manner is unlawful. The crime creates the liability.
The crime creates only the liabilities specified in the statute. It does not then create a liability for anything the victim may or may not do as a result of being victimized. While some of my analogies are deliberately somewhat hyperbolic, the stretch between saying these punks should be charged with manslaughter for "causing" this boy's suicide is not quite so far from the claim that US foreign policy was the cause of the 9/11 WTC and Pentagon attacks as would first appear.