I didn't ever argue that it was wrong because he might embarrass Ed. I said it was counterproductive in that it helped a PM who is widely seen as being unreasonable and ideology-driven in ramming through the Health Bill in turning the tables. Never said this would be a decisive move. But why hand your enemy anything at all when it's not needed?
You seem to be unable to appreciate that giving Cameron a media lifeline *is* damage, or at least potential damage. Of course the media/Tories will always have a pop at the unions. But you don't make it easy for them for no reason,.