People claim vigilantism is wrong because the government process of justice is right, but what about when the government process fails to protect society from dangerous predators??
Government is just people. There is nothing magical about government. The justice process was supposed to ensure cooler heads prevailed, that facts were used, that logic and not emotion was used, that law as we all want it is applied, but what happens when a corrupt justice system intends to harm the people? What happens when the elites buy the government, when the wealthy elites have a monopoly over the people?
King George found out in 1775.
Samuel Johnson said that justice must not only be done, but must be seen to done. Anything less than a death sentence for Mr. Goodman (cruel misnomer!) is an injustice. Life in prison is hardly enough.