In my opinion, false positives could be as problematic as real detections. If a security program is known as giving too much false positives, than some users might be tempted to bypass a warning, thinking it's a false positive and get infected. Users may always find justifications why a security suite gave a false positive: very uncommon progam, too old,... The fact is that a professional antivirus should give zero (or close to zero) false positives, no matter how old or widespread a program is. If we look at false positives results there is always a common pattern: some programs always give above average number of false positives, while other never give false positives. Programs like Bitdefender, Kaspersky and ESET are so good, that they give almost no false positives, no matter which websites or programs someone uses to test them. Test after test they always get perfect results. This gives a great confidence in the program, since users know, that when their antivirus displays a critical warning, is almost certainly justified.