Revenge is a dish best served cold. Characters from Don Corleone in The Godfather to Mr. Spock in Star Trek II: The Wrath of Khan have echoed this sentiment. It has been taken to mean that it's best to allow a cooling period and let the recipient of one's vengeance grow complacent so that one may strike when they least expect it. The phrase could also be interpreted as requiring the one delivering vengeance to be cold-blooded in order to enact the most terrible of revenge. Whatever the case, the temperature of vengeance is clear.
The inciting incident in all these cases changes, as do the players, as do the times. But what remains constant is the need to seek justice, right a wrong, and the unquenchable thirst to get the world to make more sense than it does at the moment. These historic acts of vengeance were ice-cold.