Oops, posted my reply in the old forum. Bringing it over here.
In your example, Pineapple, I do not think ~PvP is always true. There is a third proposition, that could be called Q, which states, "I will not place all of my faith into believing something is true, and I will not place all my faith into believing something is false." What would actually be true is ~PvPvQ. This means that, while no evidence is given, I must either believe that 'something' is true, doubt that 'something' is true, or not place all of my faith into either of the two previous options. However, there is almost always, if not always, the possibility that there will be evidence that suggests either truth value of 'something.' For example, gravity might not actually exist, and every memory I thought I had of gravity was a fake creation of my brain. Extremely unlikely, but certainly possible.