I suggest to every newbie who post a new thread in the Bitcoin Technical Support or the Wallet Software and Child Boards to get a warning to not disclose their pr.keys seeds, wallet files and avoid contacts in PMs...
It takes newbies quite a while before they make posts in Bitcoin Technical Support or other technical boards, their first board of contact is usually the Beginners and help section, thus that warning in the more technical boards may actually not be productive as you hope it will; I know the technical boards is more suitable for posts/inquiries on wallets, recovery, seeds etc and if there should be any warning of any sort it should be there, but newbies make such inquiries in other/any boards and they'll definitely miss the warning.
Having said that, it's going to be a hassle implementing this, especially if it's going to be in all sections of the forum to be certain it'll not be missed, but there are things that people should not be told, when transacting with traditional currencies they are already aware that there are informations about your bank/debit card that should not be revealed, thus why not the same with Bitcoin, I'm not saying people should not be forewarned, but it's absolutely impossible to protect everyone and hassle-filled to protect a fairly large number of people, as they join the network they should firstly learn the inherent security protocols themselves, and ask general/open questions on informations and situations that are somewhat nebulous to them, not sending a single user a PM on the issue.