Knowledge is indeed something that shaped millions of minds. So did a poem, a fiction, a lie. A love poem is just an opinion, but the knowledge about love of a stranger can move hearts and shape ideas which can be realistic or not. Swimming in the informational pool and seeing from where each fishy comes is a tedious task, we can understand why some would rather enjoy the view and stop wondering. Seeking true knowledge demands effort and the human mind is comfortable
It's easier to be ignorant and in the bliss of not being bothered and suffering with knowing things ;)
So it seems. But ignorance is not bliss for those who take the time to think things through.