Laid-Off Zoologists Seeks Vengeance!

I read an article about a zoologist seeking revenge after being fired from his job. The story took place a San Diego Zoo. The angered zoologist, seeking some sort of personal satisfaction, entered the zoo from which he was fired and sprayed an unknowing crowd with a tranquilizer gun. A total of 15 people were heavily sedated and unconscious for the better part of a half an hour, including the zoologist. After his mad rampage he felt that he should turn the tranquilizer gun on himself. The article is extremely brief and gives no background to the culprit or his feelings.
This story of the zoologist sort of mimics the story of V. He seeks vengeance against those that “hurt” him and sends a message by sedating himself. The zoologist’s personal vendetta becomes very public when he decides to unwillingly incorporate others into his plot to get back at the zoo itself. We see, essentially, the same aspects in V for Vendetta, just a bit more extravagant and a bit flashier.
Vengeance is one of those thorny subjects. Many do not support hurting others, but simultaneously many feel that violence on a personal level is somehow justified. In the case of the zoologist probably not so much but as for V, maybe it is justified. I am not one to judge anyone, but on the same note, who is V to judge anyone? We all go through difficult times, some more so than others. When did murdering a human being become an inalienable right simply because of vengeance? If V would have just told his story to the masses to persuade rather than murder, he could have still got his point across. It is a question of morality.