the mac os is not miraculously better at guarding against
viruses.
it's just that the majority of the world runs on windows - so the
virus-writers write viruses targeting the windows platform
specifically.
if u wanted to release the SARS epidemic to scare pple, u would
obviously release it in a large area with a large population as
opposed to releasing it in a small area with a population the size
of a tiny village right?