Agreed, he became obsessed!!!

 

When you only have handful people alive, when your wife about to give birth, when there is a possibility to be a threat, of course, it is just a possibility, but the real question is whether you are afford to risk it. Of course everyone have the basic human right to live, but that is the normal society, in the ZA world, if I was Rick, then please forgive raking lives of my wife and my children above lives of those people I do not know. And if Rick simply killed these five prisoners, then both his wife and his friend T-dog would have been still alive, of course he could choose to be a good man and do right thing, I wish he would feel the price worth it.

 

I get it...they were all under stress. And Lori played Rick just as hard as she played Shane. Shane's the one that cracked, and then got himself killed. He obviously wasn't meant for this world, because he is dead. He didn't survive it.

 

It is a little more complicated than just "sewing her up". She was bleeding out, which means propably a placenta rupture. This isn't easy to fix and a high risk problem even with the right equipment. And Hershel is a veterinarian without supplies, not a gynaecologist.

About letting Andrew live.. it was a lesson for Rick and important for the develpment of the character. He isn't a killer, but gets hit over the head again and again that people come back and kill you if they give them a chance and don't make sure they never move again. The living will kill you, so you kill the living. Even if it kills you inside and makes you into one of them.