Running no antivirus or protection of any kind means they feel their computer is safe enough to run on a public network without security issues. It’s implied based on the attitude.
Only military-grade systems on isolated networks are secure enough to not require a security scanning and feedback mechanism. Does this make sense now?
Most OS X Macs do not run antivirus software, which years ago was an acceptable risk, but is no longer.
Personally I run ClamAV. According to Wikipedia:
"The ClamAV virus database is updated at least every four hours and as of 25 December 2014 contained over 3,700,000 virus signatures with the daily update Virus DB number at 19837."I consider that acceptable protection for my home systems given that my Macs are behind two consumer-grade firewalls and are doubly-NATed. My Windows and Linux boxes are similarly protected by the hardware FWs. My Windows boxes run MSE, which is lightweight but sufficient for the work I do on them.
> Only military-grade systems on isolated networks are secure enough to not require a security scanning and feedback mechanism.
I disagree. Any so-called "isolated" network can still be attacked numerous ways, and require protection against those threats, including security scanning and feedback.
As a System Admin for a high-security network, trust me on this, I encounter these sorts of things daily.