In Tase of Armageddon we see Kirk yell at Scott over an open communicator to prepare for General Order 24. Later we hear Scott say that the entire inhabited surface of Eminiar 7 would be destroyed. Would they have done so? Apart from the moral and political implications of such an act, does the Enterprise really have enough phaser coolant for that? Or would they have taken their time, exterminate everybody over a few days?
There are times such as this episode or watching Kirks behaviour towards Professor Crater where a person not familiar with the show might have some trouble knowing who the "good" guys actually are.