Who says it's bad form to start threads about threads anyway?
I do feel really disturbed though, by comments on a thread about bipolar disorder in the mental health section and I post in hopes of reassurance that these are not typical of mumsnet as a whole! Then I think, maybe people just don't know what it means to have episodes of mania (or hypomania) and depression, and how it just isn't a choice, how the behaviours associated with those states are part of an illness?