When you are consumed with the rightness or wrongness of a given issue--whether it's fracking or gun control or genetically engineered food--it's easy to lose track of what the issue actually is. A moral compass can convince you that all the answers are obvious (even when they're not); that there is a bright line between right and wrong (when often there isn't); and, worst, that you are certain you already know everything you need to know about a subject so you stop trying to learn more.