Moderating is a time consuming task.
It also puts mods is position where they have to read ugly/anti Torah responses (which, no doubt, has an impact on their neshomas) and then make a decision to include or delete. It’s not a job I envy, although I understand the importance of it.
I just think it would be more helpful to have a brief notation made when a remark is deleted to enable to writer to recognize their “wrong”. I imagine that it would also allow mods the opportunity to track how often posters are repeat offenders so that once they hit the third time, they’re prevented from posting, at least temporarily.