This comic strip hit the spot. The problem with, amongst other things SPAM isn't the senders themselves, but the fact that people make it profitable for the sender.
As stated on secure-my-internet.com:
"Only two things are infinite, the universe and human stupidity, and I'm not sure about the former."
- Albert Einstein
SPAM, as well as email security is a social problem. Even if security software was distributed and configured by a third party for free, as long as the user isn't aware (or caring) about its usage, it will be easy to obtain through other means.
I have written several posts on this subject prior to this, and I'm glad to see that the folks at UserFrendly agree to http://www.kfwebs.net/news/312/User+responsibility and http://www.kfwebs.net/news/315/Followup+on+user+security a debate I had going with Brad