Well... they are pretty big things to not agree with him on. When it came to Larry it was about the survival of the majority, someone had to come up with it since, you know, he was clinically dead and I believe that as soon as someone dies they start zombifying. Stealing from the car was also about the survival of the whole group, morals are no longer the same; people loot, steal, kill and become cannibals. I'm sorry but taking what you find would've had to become a way of life to survive.
When it comes to the girl, I know it's cruel...but it's right, either way...she was dead. Shooting her would've drawn unnecessary attention to you both and you would've had no way of knowing if you would've been able to get out. Finally, I never dropped Ben, yes he made mistakes, but he didn't deserve to die. Kenny glared at me back at the house and shouted at Ben but, other than that, he realised he was wrong about wanting Ben dead.