Because most people who engage in the debate tend to consider piracy to be - A) theft that takes away money from genuinely talented artists who need it or corporations who will only employ stricter DRM or B) a way to make information free and fight against the massive megacorporations who dominate society and control things.
TL;DR, people get butthurt over the "freedom vs. recognition of works" thing.
How can hatred of LGBT identities be more important to a parent than their love for their child?