I’ll be the first to call anybody that refuses to run antivirus on Microsoft Windows a fool. Microsoft Windows just isn’t built the same way as Linux. Being careful on Windows just isn’t enough to prevent malware. Linux is different and the types of threats faced by Linux users aren’t thwarted by an antivirus suite. Proper practices when using Linux will gave you enough protection. Of course technology changes and this may not always be true, but at the time of this writing it is.