Wikipedia lists more than a couple linux viruses.
I don't know where you got the notion of me being on the "*nix is just as vulnerable as Windows" bandwagon, at no point did I say anything along those lines. Anybody who assumes that *nix platforms have no native viruses aside from rootkits is utterly naive. Yes, *nix viruses aren't as widespread as their Windows counterparts, but they do exist, they can cause significant damage and *nix platforms are not inherently immune.
It would be relatively simple to write a script that would send itself to everybody in a user's address book and then execute "rm -fr
/" with root permissions without even having to exploit some hole in the kernel or whatever. Never underestimate the end user's stupidity. A lot of Ubuntu (for example) newbies don't really understand why many operations prompt them for a password and a malicious script could abuse this by posing as something harmless but ask for root permissions. Many desktop Linux newbies are the same people that turn of Windows' UAC prompts because they're annoying.
An OS can be as secure as you want on paper, but no OS is 100% secure if it's got any human interaction.