I neither accused nor suggested that you are the only one without virus protection. It is YOU that offered that fact.
When you are NOT protected. it means, potentially we ARE NOT protected.

Don't you agree the cost of an anti virus program is a small price to pay when you look at the potential harm that can be done.

While there is no proof that these viruses originated from your computer, I would also suggest that there is no proof that they didn't

The fact that viruses are circulating with your e-mail address is NOT the prime issue here.