I know the reason for that....the Mac fanatics would track them down and beat them to a pulp.There has never been a significant hacker attack on OS X based Macs, despite a list of known vulnerabilities too numerous to contemplate.
I used to employ graphic designers, who, as most of you know, will cause you bodily harm if you touch their Macs. I believe that, if our building had caught fire, you would discover them next day all self-handcuffed to their Macs....going down with the ship!!