I agree, Livius, that most have been poorly instructed, but past a certain point, they have a responsibility to seek the truth. I submit this begins after they learn to read.
The problem is that most of them aren’t even aware that they don’t know the truth. I give tours at my cathedral, and I meet Catholics and other Christians from all over the country. They’re always well meaning, but they are completely, utterly ignorant. They can’t identify the statues of a single saint (even St. Patrick!), they don’t know what the Blessed Sacrament is, they aren’t sure what a bishop is or why the church is called a cathedral. Most of them no longer go to mass regularly and some of them attend Protestant churches occasionally. But they are so grateful when I tell them a few things.
I think the important thing is going out and using our tremendous Catholic treasury to impress and intrigue these people, whether people who think they’re Catholic but know nothing, people who believe they’ve left, or just curious people of good will. They’re not going to go seek things out unless somebody gets them interested in the first place, and maybe that’s what Francis is trying to do.