All of this. False positives are horrible for both antivirus companies and their customers, and great care is typically taken to avoid them. Not to mention tha

All of this. False positives are horrible for both antivirus companies and their customers, and great care is typically taken to avoid them. Not to mention that if you start alerting the user too much, they'd start tuning out the alerts; that becomes a big problem if and when they're infected with something.