Link to previous discussions?

It seems that many questions could be answered using only computing power (or computing power and network access to more-or-less static resources), and this doesn't seem like a difficult limitation to put into place. We're already assuming a system that understands English at an extremely high level. I'm convinced that ethics is hard for machines because it's hard for humans too. But I don't see why, given an AI worthy of the name, following instructions is hard, especially given the additional instructions, "be conservative and don't break the law".