There are certain features that distinguish evil deeds from ones that are merely very bad. Evil deeds bring great harm, suffering, and possibly death to people. A very bad deed merely puts one off one's lunch, makes one go "eurgh" at the thought of it, or is considered to be rather mean or in poor taste. Very bad deeds are something which a person does without any mercy or showing concern towards others, such as becoming a school teacher or going into politics. Traditionally very bad deeds happen to good people, so they should just grow a pair like the rest of us have had to.