Common sense.
All most anti-virus do is check for signatures. The best protection against malware is always being smart (not downloading random shit, not falling for phishing scams, etc...); I stopped using an anti-virus years ago and I'm pretty sure I never got any malware on my computer. It's honestly not that hard.
Agreed. Also, real time/resident AV programs require unparalleled access to the most sensitive & vulnerable areas of your OS. I'd rather police my own browsing/downloading behavior than
let AV software into my "perimeter"