You're right, it's not absolutely fool proof.
But if you send some of your BTC to another address, how can anyone know you sent it to yourself or to someone else? You still have plausible deniability, provided you live in a police state where they don't torture their own citizens.
But if you send some of your BTC to another address, how can anyone know you sent it to yourself or to someone else? You still have plausible deniability, provided you live in a police state where they don't torture their own citizens.