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.
(..) We thank you for participating in our drill. Had this been an emergency, you'd have been eaten. Because you don't listen. You're ignorant. How a man gonna bash through...? That's the problem with New Yorkers. "We've seen it all. A -foot worm! Save us, Mr. Black Man!" (..)2002 Men in Black II