'Because people have got bad minds. That's why. Look at yourself deep down inside. You know what you're really like, don't you? Not very nice, mostly, and it's not comfortable to think about it, is it? So we don't. We hide from our true selves, and when we speak, we don't always say what we think or feel. So we hide from other people too, and they hide from us. But the telepaths couldn't escape, could they?