Pepperoni pizza was an odd example to use if you're talking about the evils of killing animals for food. There isn't even much meat on there. That's just poor communication. How about you reword like this:

If you don't mind me asking... How does anyone who believes that pain and/or death is bad NOT conclude that pepperoni pizza is bad, since killing animals for food is evil?

That seems much clearer, if that's what you intended to communicate.