I am a man but haven't started any troll threads, I come in peace!
If you think a thread maybe a troll but you aren't sure then just post a simple message like ''good luck OP'' or ''we are thinking about you OP''. Then just wait a while, see how the thread goes, try not to get to emotional (hard not to sometimes I know) once the thread has been going a while and the more the OP has posted seems genuine then perhaps post more yourself.
I know some people don't have support or friends in real life so turn to places like MN for support, but when it comes to life and death situations would many of us think of posting on MN? In the deepest, darkest times when it feels like something terrible is going to happen to a loved one then I think many of us would forget all about MN, they'd forget about paying bills, forget about eating and much more. Again I know people who would post in those circumstances and who would be genuine, but I think it's something to consider.
I think MN could do a few things, like not allowing new members to post in Sex (already in place for 30 days) but add AIBU and Relationships. Not just for 30 days but also until you have made a certain number of posts in other topics first.
Finally MN is an open forum, open to everyone to read whether they are a member or not. This type of forum is usually done to grow members. MN is massive now, I doubt there are many new members who found it by accident and had never of heard of it prior.
Therefore it could make it so only registered members can log in and see threads, nobody browsing the internet would be able to read without joining. That may stop people joining to take the piss after a thread they have read