Wrighty, you just do not see the bigger picture. The workings of a group is something much more complex than pure survival.
You can't just start killing you own. It's gonna cost you dearly.
Here's how it is. Kenny killed Lilly's father in cold blood (could've been handled differently), she looses her mind out of grief, he keeps pushing and pushing... until the point everything fucks up. Larry is dead, Lilly is broken, Katjaa traumatized (kills herself), Duck bitten, and Carley an innocent victim of the circumstances.
You don't think it has to do with what you did in the meat locker? Hah, you're fooling yourself. You can't just kill on of your own.
Had Kenny let me make the right call and actually help Larry, had we survived, none of the above would've happened. Lilly and Kenny wouldn't fight that bad, Ben wouldn't be scared and betray us, Duck probably wouldn't get bitten and Katjaa wouldn't kill herself.
If my Lee is gonna be in a group I want to know that people would enter a walker infested building just to help me. If I can't count on those people I'm better off without them.