Re: Why?
The answer is NOT get a Mac. They get compromises too! You really think Apple gives a wotsit about its users? Wow!
You're correct that it's fewer because of the windows marketshare, but issues are *still* present.
Within the last 2 weeks safari was updated yet again to address the old unverified remote user executing arbitrary code thing. The update report presented on screen to users didn't contain all the detail (funny that), but the one submitted by Apple to US-Cert did:
"
Apple has released Safari 4.0.5 to address multiple vulnerabilities in
ColorSync, ImageIO, PubSub, Safari, and WebKit. These vulnerabilities
may allow a remote attacker to execute arbitrary code, cause a
denial-of-service condition, obtain sensitive information, or bypass
security restrictions.
"
Then there are the regular flaws in Flash, Java, iTunes and other extension software that are truly cross platform.
Macs, PCs, linux boxes, smartphones... all can be compromised in multiple ways, so don't be an idiot and think using a mac makes you invulnerable.