Why wasn't nirvana Banned?

In September 1991, Nevermind by nirvana was released, it had a naked baby on the cover. lead singer kurt cobain responded to the allegations of child porn with:
So that means the people who arrest, indict, try and sometimes even execute pedophiles pedophiles themselves? Are innocent people like you, me, your parents, siblings, teachers, policemen, firemen, doctors, politicians, scientists and others pedophiles themselves?
Remember to take this whole post in mind if you're gonna reply.
"If you are offended by the cover you a closet pedophile" - K. Cobain
So that means the people who arrest, indict, try and sometimes even execute pedophiles pedophiles themselves? Are innocent people like you, me, your parents, siblings, teachers, policemen, firemen, doctors, politicians, scientists and others pedophiles themselves?
Remember to take this whole post in mind if you're gonna reply.