IMO, it looks like the admin. carefully selects what emails are posted at that site. It looks and sounds like most of the emails posted come from the same people or person (posting under multiple handles?) as most of the correspondences seem to convey similar ideas that point unidirectionally, IMO.
I find it curious that a real email address is not needed to post there. If the perp has been posting there-dropping hints, tips, evidence etc, about his crimes- there might not be any way to trace the info back him? (IMHO if would be difficult but, not impossible)
BTW, how did that site get permission from a certain international men's magazine to post a certain picture?
I agree with the people who are of the opinion that the perp is an attention





. I wouldn't be surprised to some day find out that the perp is using/had been using that site as his own propaganda ministry, IMHO.