Read Thom Gidden's entire post, "Sketching Some Thoughts on the Walking Dead," here.
The world of The Walking Dead is a post-apocalyptic one. It is a dangerous and infected one. Disease and death fill it, and threaten at every turn. To survive takes courage and strength, but not just physical. Emotional strength, compassion, and a faith in the worth of surviving in a world that is so diseased and broken (i.e. it is not only classically 'masculine' traits of successful violence and protection that are required). In this infected world, the concerns of law and order become increasingly important.