The hand that feeds you can actually also be the hands that benefited from your service. In today's competitive world, I think the biting should depend on how you are hand fed and how much you cherish your dreams. I am not saying that this is moral or proper. Just that I see it everywhere, employee turning competitor. It just seems to be how things are these days.
If Roger is going to compete with his ex boss, and if his boss has been good to him, he does need to think twice about it. But whatever his decision, well, we all need to make tough decisions once in a while. If I am the good boss, I won't really be happy but that's life.