The PMs ARE moderated. If you report a message you receive, we can take action on it. Eventually we will all work cooperatively to have a mindset of reporting suspicious posts or calls to violence. I believe a good chunk of users already do this, which is excellent. This brings the level of communication from email (which we do not control) into this forum (which we do control).
The whole point of this post was that we are ensuring newbies do NOT receive weird messages from trolls. The enemy could come and blow my head off if they had the means to, but I am still here.
Moderated only if they are reported? I am not familiar with all laws Worldwide but I think for those which can speak English, then legally, PMs cannot be viewed by non-participants. Some won't report PMs and some won't realise a PM or the user might be dodgy. At least in the open, public forum, it can be seen and other users can give good advice; in PM, it's like going down a dark alley at night time in a bad neighbourhood. Off-forum, one themself is responsible for their online activities, presuming they're above the legal age to join any online communities, as well as the ownsers/runners of those websites/communities; on-forum, others who can are also responsible, and providing means to have private messages that are not public, of which less-than 100% will be seen by staff legally, and seen by other users, is not a good idea.
I don't know who will join, or has joined the forum already and is waiting, to target users. I'm not responsible for that nor having the Karma for that.
That's all. I am in the minority here with this. Enjoy the responsibility and Karma.