I visited a concentration camp today, since I am in one of the parts of the world in which they occur. It was sobering, of course.
Kurt Vonnegut said of such things "I have told my sons that they are not under any circumstances to take part in massacres, and that the news of massacres of enemies is not to fill them with satisfaction or glee... I have also told them not to work for companies which make massacre machinery, and to express contempt for people who think we need machinery like that."
He was actually talking about a different massacre, but the same principle applies.