Do you think Pineapple on a Pizza is wrong
Yes. I believe I would say it's one of my least favorite toppings, behind anchovies. Atrocious. Horrid. Culinary malpractice.
I honestly don't know why people don't stick with the traditional cured meats. Nothing beats a classic Pepperoni. 
PREACH. I do like other meats though. Pepperoni rolls are legit though, like from DoubleDave's. Ever been?