I had a similar thread on here this week and my conclusion was that nobody owns Bitcoins and therefore Bitcoins cannot be stolen.
Whomever has access to Bitcoin storage and is able to move them can do so freely. All that is backed by mathematics. Great, ain't it?
You are being dense. Whoever owns the private key owns the bitcoins, there can be multiple owners, whoever first redeems the private key is the one who "owns" the bitcoins, as backed by mathematics.
Loosing control of a key is not the same as no ownership
Nobody owns the private key, that's the point.
If I happen to generate a private key that allows me to control some bitcoins then well..... I control some bitcoins, fair and square.