What is the Point?

Perusing the intra-webs and I notice something rather strange. People can't stay on the subject at hand. I know it is... human nature I guess. But if I want to say something is good or bad, I then give reasons why I think so, and let that be that. Maybe I offer up some new facts to support my opinion in a rebuttal. But some folks get so caught up in the ensuing "battle" they forget what it was they were fighting for in the first place (at least that is what it looks like to me). Sometimes I think we let this thing called the internet make a fool out of us all...