Reminds me a lot of Rooney 7 years ago. He'd go around crashing into people and telling referees to fuck off. Old red nose sorted him out for the most part. As, Y Va says, he's lost his way and it doesn't help being at a mad house like Citeh. His captain, while an amazing player, is a young man with no big medals. Meanwhile, the guy who should be captain is off playing golf in Argentina as the team collapses.
He needs a stable environment and a coach who will set boundaries. At first Mancini acted like Mario's antics were cute, now he's tearing his hair out. That's the wrong approach. Wenger would need to be firm though. Our record on troublemakers like Bendtner, Pennant and Bentley is not encouraging.