A while ago I posted "Like Shooting Fish In A Barrel" which took myself to task for taking apart losers like Paul Krugman, Dick Morris, et al. Well, the guys over at Wizbang feel the same way. Spending time taking apart lunatic bloggers or columnists just takes away time from writing your own original pieces.
The author makes some good analogies:
Taking apart these shallow thinkers is like eating junk food - "filling and good for a quick fix, but ultimately unhealthy for you and it ruins your taste for more healthy food".
Also, his mom used to say to him what I have heard many times before and applies equally as well to the topic - you can't teach a pig to sing - it wastes your time and annoys the pig. Well put.