so lately after switching from windows to mac i've been suffering from Virus paranoia, running scan after scan every day on my pc. now i ask myself, should i have an antivirus for mac?i realize there are only trojans for mac and you have to type in your password to get them but should we run antivirus software as good cititzens? to protect windows users? to stop the spread of viruses? Voice your opinions and what antivirus is best for mac and if we even need one.