i'm sure many people have said that before, considering there are countless scripters out there skilled in that way.
and if that really was that easy, i'm pretty sure it would be widespread by now.
It really is that easy. But let's play russian virus sender guy for a minute. Why would I write something that can only infect 5-9% of computers online when I can write something for windows where it can run on 90% of the computers online? In terms of security, it's far easier for me to run as root or snag all the passwords on you Mac (Unix) laptop than it is windows outside of installing a keylogger. Granted with windows, I can just use the user SID and the password hash to emulate you so I don't need to know your password. Also, people are dumb, click anything and keyloggers are easy to write.
We run about 500 servers here. 400 windows 100 unix. Some of which are on double super scret probation networks where every packet is logged for security. Take a guess at which OS was comprimsed more often than others and used to attack or attempt to attack that network? Hint, it wasn't Windows.
I'm not trying to say windows is better than mac. I'm just pointing out that you shouldn't blindly believe that your mac is impervious to viruses and attacks. The more people who use it, the less protected you are. More importantly, if you keep that cavalier attitude towards your own security, you'll likely be the next victim.
I have a word limit on my cynicism