Currently, Phoenix, the ignorance is on YOUR part. Even Charlie Miller, the winner of the last two CANSECWEST hacking PWN to OWN contests, says it is unnecessary to run AV on a Mac. There are currently ZERO self-replicating, self-transmitting, self-installing viruses for OS X in the wild. There are currently ZERO spyware, and ZERO adware in the wild. There are about 14 easily avoided and removed Trojan horse applications in the wild. Until there is some credible threat that requires the use of AV software, it is unnecessary to run it on a Mac.
What was the situation *before* Mac OS became a Unix? I kid, I kid. :-D