Joel Spolsky (I think) wrote a good article about why he adopts a stance in his blogging even though he knows it's always got exceptions to it. Can't find it for the life of me though.
There is something to be said about presenting a clear message. It's easier to follow the flow and a critical reader should be able to take the point an author is making without blindly accepting the conclusion.
"Am I writing to get on the front page of HN, or am I writing this because I think it needs to be said?"
I haven't had a piece on the front page here, but I could see how someone could get addicted to that.
I've often thought about writing one of those opinionated pieces as my entry back into blogging, but decided it wasn't worth writing.
So I agree with you 100%.