Ooh, lovely can of worms. Which ignorance are you talking about? There is nescience, which for simplicity means one doesn't have access or has never come across the information so there's no intention or 'filtering'. That makes me a sinner because I don't go seeking and sucking down whatever ideologies I can get my hands on. Then there is what we have come across but the ignorance is intentional and often that can be relative to one's own agenda.