When you write a persuasive paper (like this one) it needs to sound like you agree with everything you're writing (even if you don't). if you want people to be persuaded (or... perhaps, get a good grade

), you have to seem persuaded yourself. really, would you even finish reading the paper if it started out like, "I really don't believe at all what I'm writing and don't think you should either, but I'm writing this to be devil's advocate." I understand his reasons for writing the paper like he did, as Iluvatar said, I think he was probably studying law or debate.
That is NOT to say, of course, that I agree with what he wrote; it has many flaws and I doubt it would stand a chance in a debate with people who knew their stuff.