Also…

"This pushes Lizzie over the edge. 'He's special and you killed him', says Lizzie. This is the psychotic break."

Actually, Carol didn't "harass" Lizzie to put down their father. Carol was going to be the one to do it, telling the girls that they can wait outside the cell if they wanted, but then it was Lizzie who grabbed Carol's arm to stop her and volunteered, looking at her sister and saying, "We should be the ones."
Mika…

I really think that they didn't want to show us Karen or David looking like they could be on the verge of death because if they had seeing their charred remains afterword just wouldn't have been very shocking and the ending would not have had as much of an impact. Not that that's a great reason, but I think that's…

Yeah. The audience was meant to believe that nothing could have changed Lizzie's outlook, that her progression was simply inevitable and that she was just plain mentally ill, but they did such a terrible job handling that.

The discussion between Rick and Carol regarding the murders takes place in the episode "Indifference" (Season 4, Episode 4)

"Either (a) the writing was so bad it failed at all to establish there was a real threat at the time of the murders or (b) Carol is meant to be depicted as insane."

My point was that's it's highly plausible that the pair were incredibly ill at this stage. What reason do we have not to trust that this was the case when we already witnessed the disease end the lives of two other people very rapidly (literally overnight)?
And yes, even without a pathology report we have very good…

I wonder if this phenomena is somehow related to whatever is forcing people to read reviews that don't like from T.V. critics they can't stand!

"By all means, too, tell me how it's at all clear with no lab equipment that Patrick indeed died of infection."

Safety is a reason not to do this when you consider the fact that Carol would have to unnecessarily handle and restrain a walker.
Setting all other arguments aside, the whole scenario is highly impractical.

"At the point of the murders, too, there haven't even been any fatalities, other than Patrick, the cause of whose death is hardly clear."

At the time that Carol made the decision to put down Karen and David they were the only ones showing signs of illness, so she believed/hoped that they were the only two infected and that she could stop the spread of the disease that had already killed Patrick and Charlie. On top of that, Carol states that Karen and…

In addition to frequent and thorough bathing, constantly combing their hair (that or their hair simple doesn't tangle!) and working the stains out of their clothes, every one of those ladies apparently takes the time to shave too (not a hairy pit among them!). Also, they all tweeze their brows or they grow in…

She was apologizing for the wrong reasons. She was sorry that she pointed a gun at Carol's head, NOT that she murdered her sister and was about to do the same with an infant child. If her inability to understand that walkers were not people was so deep that she was willing to kill the person closest to her (her only…

At the time that Carol made the decision to put down Karen and David they were the only ones showing signs of illness, so she believed/hoped that they were the only two infected and that she could stop the spread of the disease that had already killed Patrick and Charlie. On top of that, Carol states that Karen and…