In an interview from fairly early in X-Force, Percy responded to fan complaints that 'people who say Beast is lovable have only read a few comics'. ...
Magneto was probably worried about them, too. But you don't need to warn Storm about the dangers she's already aware of. He wanted Storm to keep her...
I think he was genuinely remorseful. He might have been aware he was made into a robot, but not that he would become what he is now. Maybe he wanted...