Sure but
Who's the first person you'll blame when you catch a worm and lose weeks of productivity, all because the virus scanner was disabled?
You frequently can't have the best of both worlds, and I ran into this same problem at my job: everyone complained of slow computing when we installed AV software, so I was forced to disable on-access scanning. In addition, some people insist on using software that requires local admin privileges. Now there's a worm loose and guess who gets the blame and wasted man-hours? It certainly isn't mister road warrior who downloaded Naked Dancing Pig screensavers.
You might be saying I need perimeter AV scanning and IDS AV scanning, but I either already have it or it's too costly for my manager's tastes.
My point is, in an organization that wants to have the best of all worlds, security frequently gets the squeeze and the eventual result isn't good for anyone.
