An important rule in ritual defamation is to avoid engaging in any kind of debate over the truthfulness or reasonableness of what has been expressed, only condemn it. To debate opens the issue up for examination and discussion of its merits, and to consider the evidence that may support it, which is just what the ritual defamer is trying to avoid. The primary goal of a ritual defamation is censorship and repression.
This is the third item out of eight in the list.