If you go online without a antivirus installed, it takes abot 15 seconds to become infected!
The security suites are still not mature and have been known to cause problems for folks.
MSE , Malwarebytes and sitting behind a router are what I use on my computers and laptop. Yes, I have gone about a year and half with out , chickened out and installed a antivirus and the next day a site admin and I figured out the nasty I caught came from the ad server. And as noted, Linux, because of the small percentage of users, is not targeted light Windows and now Apple.