I have not yet seen a site, even a Mourinhista infested one, that didn't yet acknowledge the mistake, but regardless, Diego still had a good performance aside that goal. Can't be said about Iker in big games in past two years.
That said, I do think this whole farce is affecting us more than it should and it's both on the player and the club. We are captain-less and it's bad. No one takes the lead on a constant basis. Ronaldo is trying to take the team on his back offensively, but it's not working and he too is affected by the lack of consistent support from the players and the formation. Marcelo as captain in the second half? Fffs... Come on Iker. Even from the bench you can help the team. Get over yourself...
Wait, what? It goes by seniority at Real Madrid and it always has been. Casillas, Ramos and Marcelo. That is the order of the captaincy. Sometimes Xabi wears it, and under Mou Ronaldo did as well. Diego Lopez is having a great season no doubt and no one has discredited his work. I don't want Casillas back because he is Casillas but I want Casillas back because he is our captain and we need him a lot.
The moment Puyol left the club due to injuries and shit form, everyone was calling for his return, for his captaincy and it made a huge difference for them, and we are suffering the same. It is not the only problem, it is not the main problem, it is a thorn though. I am all for Diego keeping his position because he's earned his right to play for Real Madrid and I always liked him but this whole thing is a farce. That is two big games now without our captain which we fucked up, Ateltico and Barcelona.
Having said all that, Ancelotti takes home the blame 100%. Diego or not he is full of blame for his starting line up, for his selection. Diego made a mistake because he is human, but that first half was utterly uninspiring, very leaderless. Which is also partially Ramos' fault.