[ Ryuki's a police officer. He'll definitely hate the idea of living under the same roof as a murderer regardless of what Hanako's reasons were. Datz might understand his reasons, but he's also a nice guy in general- there's no way he'd forgive so many transgressions ]

The same reason you'd want to keep a puppy safe, until it grows up to be a wolf that's killed half your flock. I'm the evil spirit of a murderer, Temenos...

[ he's the furthest thing from a sweet innocent child ]