People get astonished when I insert a virus infected USB disk into my Windows machine and use Explorer to safely copy files from it. And when they ask what anti-virus I use, I say "None, never used any anti-virus in my life. I reversed engineered a lot of viruses and I know how they work."
> Please never apply to a company that I am working for!
Sure. Thanks.
You know a lot of viruses, you don't know all the viruses. How can you discount the possibility that, one day, the USB interface itself will be subverted to spread viruses ?
It can. But then I would know about it as soon the AV companies know. And I can take the precaution accordingly. If that is a zero day [remote] exploit, then I am toast, with or without anti virus.
The point is: anti-viruses would probably make me 10% more secure over what I already am. Therefore it's not worth it when one considers its cons.