1. Mueller has basically bet that none of the 12 Russkis he indicted will show up to call his bet. After what happened with his last batch of Russian indictments I think that was an unwise desperation move.
2. Regardless of how all those DNC emails became public, when the truth hurts you the problem is you. And, "No fair! I shouldn't have got caught!" is a particularly unpersuasive argument.