I agree. I think we need to be very careful about shouting "troll" - which is going on a lot at the moment.
Yes, trolls can be hurtful, but equally if someone is desperate for advice, imagine how hurt they could be by not being believed.
By all means if people are getting emotionally involved, offering money, offering to meet up etc, and you suspect that the OP is a troll, when it's time to step in, but surely the whole point of Mumsnet is that generally people get a sympathetic / candid / helpful hearing?!
Also, even if the OP is a troll, any advice given could well be helpful to others. What have you lost if you offer advice to someone whose OP is fabricated? Surely it's just the same as replying to a hypothetical scenario?
And some of the thread I've seen people shouting "troll" on recently weren't even in any way suspicious or unbelieveable - just someone's first post under a particular name! Come on guys, we risk turning Mumsnet into a clique, where you have to be "known" to post.