Since violence and criminality dominate much of Fyodor Dostoevsky's Crime and Punishment, we often have to peel back layers of text to get to the love. Most of the novel's "romantic" relationships are loaded with cruelty, power plays, confusion, and miscommunications. It can seem as if love and kindness are winking shyly at us between the lines, terrified to venture into the harsh world of vice and victimization Crime and Punishment shows us. But love is worth looking for in Dostoevsky's masterpiece, where even incredibly perverse characters are capable of loving acts and moments of kindness, and redemption is never completely out of the question.
Porfiry Petrovitch loves Raskolnikov, and that's why he doesn't arrest him.
Sonia's love for Katerina and Marmeladov is actually destructive for her.