On bitcointalk, there's no guarantee on anything you have as deal with other members if you don't trust them then avoid making any transactions with them, you're independent on the forum but if you risk making yourself dependent then at your own risk because the forum is not liable for any risk you took or with whom you had it with
I trust this community, once there's enough convincing evidence they will definitely do the proper thing by tagging them, maybe there's more to discover about them on this before necessary actions are taken against them.