I mentioned the "Letters to Cas" (Misha hasn't read them because he hasn't been home yet) and told him he might cry when he reads them. He said he knows the importance of Castiel for the fans, not because of the letters, he hasn't read them yet, but because there were fans in the past who told him they had an accident, and they imagined Castiel next to them in the hospital, guarding them. He said he also loves Castiel.
Misha talked to the writers mid-season and told them "I think this character means more to the fans than he means to you guys. You can't flip a switch and make him suddenly go evil, like Ruby. Oh she was a demon, so she's evil! So, we got a Castiel episode, we saw his reasons, and hey, he's doing it all for a good reason; who knows, maybe he's averted Apocalypse 2."
I said, what does it matter if the end result is the same (I meant, becoming evil), and Misha thought it mattered because we saw why he's doing it. I said "But that's what they did - they flipped a switch and Castiel became evil", and Misha replied "But that's because of the souls." The fan on my right exclaimed "He killed Balthazar!" at the same time I said "He broke Sam's wall before the souls!" Misha said something along the lines that Castiel broke Sam's wall because he felt he had no option, because he was trying to prevent the Apocalypse. I said I could watch S7, if in the premier Sam and Dean got the souls out of Cas (you had told me this after the finale, datenshiblue), and he reverted to himself, and Misha shook his head, replying immediately and with conviction: "I'd be shocked, I'd be extremely surprised, if they did that in the premier. Now they've done this, they're going to milk it."