So we really have no proof that any of our generalizations are true, no matter what faction we belong to in this argument. So once we get away from these generalizations we keep making and start dealing with specific instances, testimonials if you will, we can start establishing some basis of facts that we can use to establish valid arguments.

For example:

Community Member Post "A": Last night I was in a Light Party and a PL-party was next to us in camp, and I went from level 30-35 in 2 hours. The PL-party did not affect our light party's ability to kill mobs or recruit and keep members during that time.

Community Member Post "X": Yesterday, I tried to form a light party, but no one would agree to join unless there was a PL. After an hour of trying, I finally had to give up and solo instead.

Those are examples of facts. The reasons why they happened the way they happened can and should be debated, but the fact that they happened would be indisputable. Ideally, that's how this discussion would proceed. I might be naive, though.