Without wanting to sound condescending, I'm not sure that the average Mac user is sophisticated enough (in terms of technical expertise) to detect interaction t

Without wanting to sound condescending, I'm not sure that the average Mac user is sophisticated enough (in terms of technical expertise) to detect interaction that has been initiated by malware. So many years of being told that there's no such thing as malware for OSX (and so no need for anti-malware) may have produced fertile ground for it. Of all the people with Macs I know, just one has an anti-virus installed.