Do you like detective/mystery series, like Detective Conan, Kindaichi shounen no Jikenbo, Tantei Gakuen Q, Karakurizoshi Ayatsuri Sakon etc? I am especially a fan of Kindaichi, as it has longer plots, usually 4 episodes each, leaving room for more character development and plot twists.
By the way, I noticed that in Japanese detective fiction the murderers at the end are often portrayed a little sympathetically, at least compared to the victims who are usually complete scumbags. It's somehow strange, imo, that only a few of the cases in such anime contain really "evil" guilty parties without scruples, unlike for example in Western classic detective fiction, like Agatha Christie or John Dickson Carr, where the murderers are usually really deserving of the term "bad guys". What do you think, why do Japanese authors prefer sympathetic murderers and "evil" victims?