Perhaps you have seen the following comedy routine by Chris Rock (warning - absurdly NSFW):
I use this clip to illustrate the fact that within any group, be it racial, ethnic, socioeconomic or what-have-you, there may well be deep divisions. And so it is among the living impaired. Frankly, it breaks down into two main groups: the Living Impaired and Zombies. I consider myself Living Impaired, not a Zombie. Perhaps the following guide will prove useful in determining the difference between these two distinct groups.
Living Impaired: Has a brain patch on his arm.
Zombie: Has your brains in his stomach.
Living Impaired: Speaks clearly and intelligently about a variety of topics.
Zombie: Just says "BRAAAAAAIIINNNNSSSS!!!!" a lot.
Living Impaired: Walks.
Living Impaired: Is fastidious about his appearance and hygiene.
Zombie: Doesn't notice that he is decomposing all over your living room carpet.
Living Impaired: Tries to build bridges between the living and non-living.
Zombie: Tries to break into your kitchen through the window so that he can eat you.
SUMMARY: Those creatures you see in Left 4 Dead 2? Those are zombies. I don't like them either, and I don't condone their activities. But, believe me, they are a minority within a minority and do not represent the vast majority of hard-working, rule-abiding living impaired individuals across this great land and throughout the world.
Remember: there is a difference.