"Hurt Locker" was the movie that made American soldiers look like psychopaths - and since that fits the Left's narrative, they welcomed it. They aren't concerned now about Chris Kyle looking like a psychopath - they are concerned that the public might approve of his actions.
We could further check on the hypocrisy.
Wonder if he got worked in a lather about Enemy At the Gates the story of Vasily Zaytsev the famous Soviet sniper? What? No mention of a similar story about a communist?
We can see the agenda the leftist displays.