[wtallis]

Having an opinion doesn't itself discount an opinion. Being biased or unreliable is reason to discount an opinion. It's important to remember that those are separate concepts.

Bias has nothing to do with how strongly you believe something to be true, or how hard you try to spread that opinion. Bias is nothing more than the extent to which your opinion differs from reality. If you consistently and vehemently insist that the earth is round and not flat, you aren't biased, you're right.

And regardless of bias, you have to also take into account the specific evidence and reasoning provided with an assertion. PJ in particular is pretty good about explaining her predictions, so you can't dismiss her solely due to her bias - you also have to find fault with her reasoning.