Because, pineapples have enzymes that degrade meat
In other words, while you're eating pineapple pizza, the pizza is eating you.
That kinda Vore is messed up
Here's my opinion about this whole topic. I love pineapple on my pizza becuase it brings the sweet and tangy to a savory and salty marinara sauce. Pineapple/Takumi, always prickly and butt to the very end.
Pineapple on Pizza? What are you, a Satanist?
In all honesty, though, I eat and love pineapple pizza. Also, the abominations Pizie is posting are much worse. Though part of me wonders what Spaghetti Pizza tastes like.