Anti-botnet campaign by FBI

Botnets are a major nuisance on the internet. These are a large number of computers having inadequate protection, that have been compromised and are under the control of people wanting to use these large number of computers (in many cases, in the thousands) for a number of activities such as launching distributed denial of service attacks where these computers together attach a web site or network, used as relays for mass distribution of spam and malware, used for phishing, click fraud, and a variety of other attacks.
How does a computer get compromised? The computer may be running a version of Windows that has a hole, and this hole has been exploited to gain control of the computer. In addition, the computer may not be having an active firewall and virus protection. Botnets are increasingly being found on the internet and cause a high degree of costs by causing down-time, by actual losses due to phishing and click fraud, etc. And the biggest problem is that users do not even know that their computer has been compromised; they find that their computer has gone slower, or becomes active suddenly, but there are no easy ways of knowing that their computer has been used by a crime or is compromised. Typically, when a computer has been infected and is a part of a botnet, it can be used to attack hundreds of other computers.
Given this situation, and the dangers posed by the menace of botnets, the FBI has been investigating and found more than 1 million botnet victims so far. Along with the Justice Department, the FBI has been running a program called Operation Bot Roast to disrupt botnets. They have caught people; however, as long as security patches determine the safety of a computer, there will be infected and compromised computers in the wild. Refer this article:

The FBI is working with industry partners, including the Computer Emergency Response Team Coordination Center at Carnegie Mellon University, to notify the victim owners of the computers. Microsoft and the Botnet Task Force have also helped out the FBI. Through this process the FBI may uncover additional incidents in which botnets have been used to facilitate other criminal activity, the FBI said in a statement.
Bots are widely recognized as one of the top scourges of the industry. Gartner predicts that by year-end 75 percent of enterprises "will be infected with undetected, financially motivated, targeted malware that evaded traditional perimeter and host defenses," and early reports from beta customers of a yet to be released product from Mi5 show how nefarious these infections can be. Mi5 says it installed a Web security beta product at an organization with 12,000 nodes and in one month detected 22 active bots, 123 inactive bots and was watching another 313 suspected bots. That may not sound like a lot, but those bots were responsible for 136 million bot-related incidents, such as scanning for other hosts inside the firewall.

It can get pretty hairy for people. Suppose the computer of a unsuspecting user is used to break into a protected military installation or a bank, or used to break down a major network, the first path for investigators will be to find the computers that were used, and in the case of a compromised computer, the owner will have no idea.
This will also start to increase pressure on software companies to make their software more secure from the ground up, such that they do not land in the situation where the security of the system is dependent on patches.