Glory
On the one hand, you're giving people exactly what they want: pizza. On the other, you're probably contributing at least something to our nation's astronomic obesity epidemic. Personally, we prefer to ignore the second hand and stick to the much tastier first hand.
There's really nothing intrinsically great about what you're actually "doing for others," unless your restaurant participates in charity events, donates extra food to homeless shelters, or specifically hires those who have the most trouble finding work. Ordering cheese, arranging red pepper flake shakers, and hiring a good server are a far cry from being a doctor without borders.
Still, elevating humanity isn't the only way for you to feel good about what you do. Sure, you're working long hours, dealing with unruly staff, and arguing with commodity distributors, but if it's your restaurant, then you're doing it all for you and no one else. And that's got to feel pretty good. Unless you go out of business.