We were 'blissfully ignorant''of' the problems that had occurred.
She was 'ignorant' about the dangers of the drug.
They were 'ignorant' [='unaware'] 'of' the facts.
(..) My ignorance amuses me. "My ignorance amuses me." - My ignorance amuses me?! - Yes. I've always found your ignorance quite amusing. Powell, however, is not ignorant. - No? - No. He's a liar. - Anything you need? - No, thank you, Hillary. - Don't you stay up too late. (..)2001 Lara Croft: Tomb Raider