There are no viruses for Mac
On the contrary, that macOS has been less affected by viruses in the past has resulted in weaker defence mechanisms. And this myth is exactly what makes macOS attractive for virus creators and social engineers. Sleepy users and weakened defences.
Apple quickly fixes vulnerabilities
Nope. In May 2019 Filippo Cavallarin discovered a vulnerability in the Gatekeeper, gave Apple 90 days to fix it, and having had no response, went public with it on his blog. Gatekeeper is the tool that prevents unauthorised apps from being installed on a Mac.
And Filippo Cavallarin was not the first. Independent virus researchers who discover fresh security holes often get vague responses from Apple. And even when, the solution take a long time.