I appreciate that mn struggled to keep on top of all the posters accusing the op of the story not being true, but it's likely that deleting the thread is exactly what they wanted.
Perhaps you could have put a warning about troll hunting is not tolerated and allow the debate to continue.
No one can with certainty say a lot of what is posted on mn 'actually happened' but the thread had discussions of women's safety issues on it which warranted remaining.