When does someone not have a personal opinion of someone else supporting their personal opinion though? You could easily disregard anything using this method of problem solving. Research is opinions of someone else you use to back up yours. It's his personal opinion, but what if it is a good personal opinion? It isn't about it being a personal opinion, it all comes down to that if it is a good one. All opinions, in this case at least, involve others. His opinion is now out there to the public. Even if it is a lie, it still doesn't defeat the fact that it exists as a lie, thus it wouldn't hurt to take it into account even if it was a lie. If it was a lie, does it really matter if you take it in? You won't see it as a truth if it is a lie so there is no harm in taking his opinion into consideration. Otherwise you are creating a self-fulfilling prophecy about him being wrong, never giving a chance for him to prove himself right. If you know your right, this "lie" will not hurt to take into your database of knowledge. I'm not trying to make any arguments here, I am just trying to keep the peace.