Not splitting hairs. The distinction is major. There has ALWAYS been malware that targetted macs. Back in the OS9 days it was much bigger deal because we had genuine viruses, which could infect a machine and self-replicate without any any participation from the user. These were pretty minor compared with windows viruses, but they were bad enough to temporarily cripple a couple of studios I worked in.
Since OSX, that concern has been over. No one has been able to make such an attack work in real life. There have been a number of trojans and other "social engineering" exploits, this most recent being (maybe) the most sucessful. But they are all easy to guard against. Simply following normal practices on a mac, and not giving up your admin password for a request you don't understand, will protect you.
This situation won't change. It's not possible to make an OS structually resistant to social engineering attacks in the way that OSX is structually resistant to viruses.
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