I was wondering the same thing..( ie, why think the source are any one particular group) though I am new to technology, so am following this thread with interest
I am currently receiving something like 30 emails aday which are sourced from various places that are streaming through my email address that I don't use for this forum.
There is definitely a huge increase in the amount of viruses generated around the web via emails and I think most of it is due to unsuspecting people who have the virus/ worm/trojan etc on their hard drive or in their address book and often don't realise it. Certainly that is how it is in the other forums/ email groups I belong to.
Still listening with interest
Carol