Consider a newly risen zombie to be like a newborn human in some ways. Instinctive drives are the only ones really present, and the only ones generally followed. However, the equipment for higher brain activity is more delicate, and has been damaged, or mostly destroyed before the Z can re-animate. They may form new ways to work around the damage and get some thought processes back, but it's unlikely they will ever return to something approaching normal mental capability. For evolution to take place, multiple generations are needed to grow and shift into a new form or pattern. Zombies don't reproduce, and cannot have sucessive generations. Now you're talking about changes in human populations to make the human a better Z. That's just creepy...
For busting Zombies I keep a small claymore near the bed, a yugoslavian war axe with spike pommel in the closet, and I'm looking for a good mace or morningstar. My motorcycle leathers do double duty as anti Z body armor, and I always keep hammer and nails in the house. I've also got a .22 caliber pistol, loaded with "popcorn" subsonic bullets.. Quieter, so you don't draw a chain swarm when you have to take a Z down! Know your escape routes folks. Zack is out there, and he's always hungry!
a zombie genious!