A little background on the show for anyone who doesn't know it. The Walking Dead is a running tv show about the zombie apocalypse happening and the following of a certain group of survivors who are trying to fend of the horde of zombies while also trying to find a way in making a living for themselves and their families. While the survivors include the most ridiculous group of people ever, I'd have to find one of their characters to fit perfectly.
Shane, being one of the main characters of season 1 & 2, is a survivor. Plain and simple. He shows during the evolution of his character that he will manipulate the people surrounding him as well as the surroundings to his advanatage to ensure his survival and the survival of anyone he sees fit. While doing all of this, his decisions may be presented in an over-the-top fashion, but he does what is needed to be done for the sake of the group and to make sure no more of the group gets killed off.
For the sake of those he loved, he has sacrificed his mentality and his principles to benefit those and try to make even the slightest ounce of difference for their lives.
He does all of this while nearly getting bitten by brainless, insane, dead walkers on what seems like a daily basis. HOW DO YOU KEEP YOURSELF AND OTHERS SAFE LIKE THAT??!?