The Internet as we know it today was designed to be a place where people could go about their business anonymously and without interference from other users. This model worked reasonably well for a long time, but it s become painfully clear in recent months that some fundamental changes are needed in the way people use the network. Every email even innocuous looking messages from your mom must be considered suspect, and thousands of legitimate Web sites are infected with malicious code and are busily attacking unsuspecting users every day.
Source: https://threatpost.com/radical-steps-are-needed-fix-internet-security-041409/72587/