That's a good analogy. We are being forced to bear the burden of not having installed a sophisticated alarm system to prevent people from breaking in. Last I heard, you aren't allowed to walk into someone's house and take what you find just because the door isn't properly locked.
That's where the problem lies. A tremendous amount of awareness-raising is needed as far as students and teachers are concerned. When teachers stand in front of a classroom of students, their minds like sponges, and send them photocopies of photocopies or project copyrighted content onto whiteboards without authorization, how can students—the teachers of tomorrow—possibly understand and pass on the concept of copyright?