Why macOS is unbelievably insecure

It’s generally safe to assume that the only protection for any computer against physical access is drive encryption. Setting aside other options, it’s simple to just rip out the hard drive and mount it on another computer.

You talk about “viruses”, but nearly everything here is irrelevant to viruses. These tricks don’t make macOS insecure, they’re just easier ways of doing something that’s already nearly impossible to protect against.