Tip II: To create a Lovable Villain you need to make them characters to whom readers can relate. There are ways of doing this that will help our readers empathise with the most miserable antagonist.
Villains can own their own set of injustices. If they feel they are ‘hard done by’, by society, life or circumstance, they not only have an understandable reason for maladjusted behaviour, but they will have enough logic for their actions to allow the reader to have some sympathy towards their plight. From a single human frailty, such as fear, jealousy, or loneliness your villain can still generate evil but they will also have at least one character trait for a reader to relate to.