5) It makes life simpler. Throughout most of human history, life was extremely simple. You were a child, you got old enough to work, you got married and had kids, you farmed, and then eventually you died. There’s still a certain appeal to that kind of lifestyle. That’s part of the reason movies like Avatar are popular and Henry David Thoreau’s “Walden; or Life in the Woods” is still considered a classic.
Zombies would make the world very simple again. Instead of worrying about global warming, Social Security, and getting the latest Apple product, life would be back to the same pattern it followed throughout almost all of human history….well, except for the dead people who want to eat you.