I gave the example of following gravity, and in general it is following all of the laws of physics, e.g. by resisting the pressure of other things in contact with it, and so on. Of course, the laws of physics are also responsible for it executing the program. But that doesn't mean the laws of physics do nothing at all except execute the program -- evidently they do plenty of other things as well. And you are not in control of those things and cannot program them. So they will not all work out to promote paperclips, and the thing will always feel desires that have nothing to do with paperclips.