Sisterofshane, this is so untrue. You can't just say that he didn't see Lee saving his wife. Even if he didn't I'm sure that she told him. That isn't something you hide, especially from your husband. At the farm he had time to tell Lee he is not a good friend, so he had time to say thank you as well. But he didn't.
And no, I don't assume anything. No zombie can jump on his feet right away. He would still be on the ground, not as mobile as you apparently believe. Not that hard to hit him with that salt-lick. Plus Lee and Lilly decided that they are willing to risk the possibility of a bite in order to save Larry. They are grown ups, they can choose for themselves. They didn't ask Kenny to risk his live right? But he just disregarded their choice and killed him in the most gruesome way. I can't really understand where does your passion to defend Kenny come from. As other people said before me with Kenny there is only 1 option - His way!
Even if Lilly or Lee were bitten, which I'm sure wouldn't have happened they wouldn't die right away and turn themselves. He wasn't protecting them and he wasn't protecting Clem. He just wanted to go out as soon as possible.
If you kill Lilly's father in such a way, it is quite natural that she wouldn't care what happens to you. But if you try to save a man, it there is no reason that would explain why Kenny wouldn't help you. Except the one that he is a spineless, egocentric asshole. There were no risk there. Danny was completely focused on Lee and had his back turned to Kenny.
P.S Sisterofshane, I suggest we give word to the people as well. We kinda hijacked the thread. So I'm backing away from this topic for a while