Only by comparison with snake-oil like Hushmail, or with not having any security at all. We are talking about a non-trivial problem here.

For what it's worth, it is not hard to encrypt a message and post it to Usenet. It is imperfect and vulnerable to traffic analysis, but it is not hard. It is even easier to just send encrypted emails and not bother with anonymity. I have personally seen non-technical people using PGP or S/MIME without assistance.