Not just evil deeds, which can be carried out in pretty much any levels of lighting and climatic conditions. In fact, some of the most evil deeds are done by well-fed men sitting in tastefully lit rooms on comfortable chairs as they fill out paperwork and give orders, with not a flaming brazier nor a throne made out of skulls to be seen. No, these were Evil deeds. The difference is, the person who coined the phrase 'the banality of evil' had never encountered real Evil, which always tries its best to be stylish about things, and even when it fails at least fails in interestingly tasteless ways.