This is wrong. Mac malware is on the uprise and there are already things out there. A mac is less likely to get infected but just like windows if its configured incorrectly its just as insecure
All you have to do is: Not install unnecessary software Make sure your OS and all components/software are all UP TO DATE Keep you computer clean Be smart with emails Be smart when browsing the web Dont be gullible Antivirus is less important than any of the above
I think Anti-virus still important. Not all have the ideas and habits like you just listed. And not all have the skills to detect and remove viruses all themselves. So at least Anti software can help to automate their computer security at some extent. It also saves time rather than doing it manually. That's my opinion