If we were to stumble into a Class 4 Outbreak, zombies everywhere/ world in chaos, or even in an early stage 3, I think everyone overlooks another big threat.
Granted, a person can be calmed down. A person can be reasoned with, persuaded and even pacifed into commen sense.
However, in the middle of a zombie ridden world, mass hysteria is bond to happen and at some point we're going to find ourselves with resources dwindeling. Walmart food does have a shelf life, believe it or not, and people can get pretty nasty when they are starving, dying of thrist, in need of medical supplies or transportation.
And given the circumstances, they could very well be armed.
So, I'm sure everyone here is sound on where their moral stance is on killing zombies.
But what about your fellow man?