Chiellini isn't even looking at the ball. He deserved what was coming. He knew that this ref won't allow our defensive tricks, yet he continued doing them. We were unlucky to get a ref (linesman) who whistles this kind of contacts, but once we realized that this is the case, Giorgio should have known better. I can't blame Ronaldo for trying to get the most out of this, but Chiellini was begging for the punishment. There was no need to pull Ramos like that. Yes, you start with a shirt pull, but once he realized that Buffon will get to the ball first, he should have let off the jersey. Same with the red card incident. Just look at him. He's actually closer to the ball and instead of trying to get it, he does the most stupid thing one could do, especially since Ronaldo wouldn't have had the best angle to score, even if he got to the ball first.
The defeat is 100% on Chiellini. Not on the ref or Ronaldo.