Delusions are fine as long as they remain delusions. When people act on their delusions you get results such as the Jonestown mass suicide, The latest delusional person who brought weapons to a theater in Colorado, etc.. Expressing ideas and thoughts are great as long as they can simply remain in that realm. What happens when you try and "mix" reality with non-realities is where things can get dicey.
As to the Aikiweb, I agree with the sentiment that after time, those people who insist that their thoughts and perceptions about Aikido are some higher truths, in the face of a differing reality, should not be responded to as much as they seem to generate some kind of morbid interest (like slowing down to see the accident on the side of the road). I think that like the accident on the side of the road, those people will continue to garner interest. Those that seek real change also know where to look. At the end of the day, people can either grow in their pursuits, stay stagnant, or simply get worse. No expressed ideas can ever hide that reality.