I assure you in case of a zombie apocalyse, 80% of us will become greedy, selfish, unlawfull things that dont give a damn what happens to anyone besides themselves. I am not a pessimist but a realist and based on my life experiences, we all have dark sides that society forces us to cover up. By that i mean we are naturally evil people in this day and age.
As for me, I would be the exact opposite and its great if you think or say you will too but I KNOW that most people if not almost all will not be willing to rely and most importantly help others. In other words most will become lilly or larry. I think lee is a pretty unrealistic character.