It's definitely true that to understand your own position you need to come up with the best arguments for the opposing position. It disappoints me when I read lousy arguments made by those who do not share my viewpoint, and even more when an entire position shared by many people is based on emotional reasoning.

Torture is a topic that lends itself to emotional reasoning. How can you be such a meanie? How can _you_ put children at risk while terrorists are running free?

DU also lends itself to sloppy reasoning. People take for granted that it is a radioactivity problem when it's actually a heavy-metal toxicity problem. Radioactivity is more emotional.