because the quality of the forum suffers when people start redundant threads and letting the OPs know this is the only hope of correcting this behavior. Moderators need to combine threads but there's absolutely nothing wrong with mere mortals informing an OP about the norms of the forum.
Like, why are you trying to moderate the citizen moderators?
Redundant threads don't bother me. Got other things to annoy me throughout the day. To each their own.