Even the evil become evil because their heart was tortured.
Who doesn't love a good, complex villain? If you don't have a good villain, then you can't find a way to root for the good guys. The villains are often misunderstood and if maybe someone would give them a hug once and awhile... the world could be a lot safer, like for real.
One of my closest friends is a cannabis entrepreneur in Colorado. Recently I got to help her out packing orders. Somewhere around hour 7 with my fingers raw from work I sighed and went "UGH. TV lied to me. There is so much packing tape involved in being a drug dealer! Nobody told me about packing tape!"