If one trolls, I will report and leave it to the moderator to handle it.Being trolled is part of being on the internet. You gotta roll with it.
And I would say shared belief is a good reason why to suspect a member of being an ex member. What else would there be?
That is also part of the internet as several of them found out.
And shared belief is not a good reason because there are lots of members with shared beliefs.
They are not all the same.