His crimes are not forgivable, but Batty is one of the replicants who knows the truth. Replicants are evolving. Because this could change everything, he also knows humans will deem him an anomaly–which he isn’t.
He is the decided antagonist of the ’80s classic. He’s worked hard to become the top guy of the Top Gun school. After years of training to be the best pilot he could be, “Maverick” comes along and shows a complete disregard for everything he firmly believes in, including everyone’s safety.
Say what you want about Miranda Priestly (Meryl Streep), but she has a tendency to bring out the best in people, even if she often breaks them down first. Priestly sees Andy’s specialness, nerve, and potential.
He was never the same after he witnessed the unspeakable horrors of the Holocaust, profoundly aware of what humans are capable of at their worst. In turn, he feels his people need to be prepared to fight back.