That includes the early days of Mac when the operating system wasn’t Unix-based with all of its built-in security features.
The answer to the question “Do Macs need antivirus or anti-malware software?” is “No, but…” As a Mac user since late 1984, I have never had a virus, and I’ve rarely seen malware that caused an issue for more than just a few minutes. When new Mac owners first set up their new machines, one question they may have is whether or not they’re taking a risk by not installing that same genre of application on their Macs.
The other reason? The miseries of the tools that allegedly fix those problems but cause even new PCs to run slowly and crash more often. One reason that many people move from the world of Windows to macOS is because they’re tired of the hassles of having their PCs infected with viruses and other malware.