Breaking into a private home is a bad analogy.
This is an international corporation who is responsible for keeping its customer's information secure.
He and his employees are some of their customers. He found out that their (and everyone else's) info was NOT properly secured.
If you still need an analogy, even though none is needed, imagine you were curious if your bank's website would take database commands, even though it should not.
You are shocked to find out it does, so you try some more commands, and then send them an email advising them of the hole, with proof.
Dumb? Perhaps. Whose fault? The website owner.
Obviously he was worried from Apple's public wording, that they were going to try to lay the blame on him, and that's why he went public.