I enjoy people thinking things through and working out consequences sensibly. Seeign that the end result of many small sensible decisions is different from the result that people think we might otherwise have achieved if we'd thought long-term, and explaining why we might not get the "optimum" result because it's too expensive in time/money/effort to do something that might otherwise appear the right thing to do.

I appreciate idealism when it comes to fiction, but I'd rather have pragmatism in real life.