That's what they say. It's just a Disney Film Created by....well...Disney. It's their story so whatever they think, we usually believe them since they made the movie themselves. But just because Disney didn't mention or create a backstory for Hans, doesn't mean he's what we think he is. Lots of people say he's a monster cuz he pretty fked up. But to be honest, Elsa's pretty fked up herself too. Hans probably had the same horrible childhood. It mentioned in the movie, a few of his brothers pretended he was invisible for 2 years. He was the youngest so he was probably mistreated by his family. Disney just didn't put that there yet.