I want you to think about why scams are apparently unmoderated on the forum - the reason that was given - and then try to imagine how that would apply when Newbies aren't given any welcome messages or warnings about all members (especially outside of the convoluted trust system). Might be a bit cynical but it's not hard to notice some glaring things that are missing.
As hard as it may be to picture me
thinking, I have once or twice. The unofficial (official) reason given is a bit sparse, I must admit:
19. Possible (or real) scams and Trust ratings are not moderated (to prevent moderation abuse).
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Frequently asked questions (FAQ)
Q: Why haven't you banned <insert scammer username here> who is an obvious scammer?
A: Possible (or real, not for me to decide) scams are not moderated to prevent moderator abuse. If we start picking out which ones we call "scammers" and ban, we would make a lot of decisions based on biased opinions.
But it actually makes perfect sense. Bias is real, and humans are prone to it. Mistakes are also possible, regardless of bias or any other ill intent. Would a welcome message help? Possibly, it couldn't hurt. I may not be as optimistic about it's effectiveness as you are, however.
Another possible reason for the admins' neutral position could have something to do with this:
I'm an anarcho-capitalist
Which, in light of where we're having this discourse, also makes sense.
Despite the absence of a welcome message, or lack of moderation, the forum is not to blame for scams. No one is to blame for scams other than the scammer, but the other thing that's needed for a scam to work is a victim. That's the unfortunate reality. Some of us are just stubborn, and need to learn things the hard way. Scammers are nearly impossible to prevent, and victims only slightly less difficult.
Just a day or so ago someone claimed to be scammed by a tagged and flagged AWS account scammer. That means they clicked on the scammers thread, ignored the big red banner across the top of the page, ignored the little red negative numbers next to the scammers name, and contacted said scammer anyway. Even if there was a welcome message explaining how all this stuff works, it'll only work if it's not ignored.