I think Rick is trying desperately to preserve some of his old world humanity, while Shane has gone fully feral.
Which one is right is really up to the viewer and why I think there is so much debate as to whether Rick or Shane is the better leader.
I hope the show in the future explores more about the world, and what the effect of the zombie epidemic has done to world governments, if there are possible holdouts and safe havens, and what the game plan is of the biggest survivor groups; simply survive or formulate a plan to take back the world.
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