Every computer should have an anti-virus, doesn’t matter if it is a mac, a linux or windows OS.1st although the latter two are overall more ‘protected’ so to say, not getting into tech details, they are still susceptible to malware and sniffing etc.Second you never know when someone sends you an infected file, even if it doesn’t infect you doesn’t mean you shouldn’t be prepared to remove that virus instead of spreading it further.I recommend ESET and ClamAV, they’re multi-platform and for me they are the best performers.