Daily Fallacy: Ad Hominem Ad Hominem is Latin for "to the person". The ad hominem fallacy is when you attack the arguer, not the argument. Scientologists love to employ the ad hominem fallacy, ignoring legitimate criticisms in favor of attacking the critics who make them, generally calling them criminals, child molesters, etc. Other examples of ad hominems can be found pretty much everywhere on the web. They usually take the form of "You believe X. Unfavorable person or group also believed X. Therefore, you're like said unfavorable person or group." Another form of ad hominem is the ad hominem tu quoque. Tu quogue refers to the fallacy that a person's argument is invalid, if the arguer doesn't practice what he preaches. A great example of this is when it became known that, despite what he said in An Inconvenient Truth, Al Gore uses an inordinate amount of electric power. While this may be true, it doesn't mean he's wrong about global warming. Yet another ad hominem is guilt by association. Fundamentalist preachers use this one a lot, attempting to put folks like Charles Darwin in the same boat as the likes of and Adolph Hitler because there may be a tenuous thread connecting them in some way. Even if Hitler was influenced by Darwin, if doesn't make anything Darwin said any less accurate. A close cousin of the ad hominem attack is Godwin's Law. Godwin's Law states: "As an online discussion grows longer, the probability of a comparison involving Nazis or Hitler approaches one." Read any serious discussion online to find this. When all is said and done, the ad hominem is a red herring fallacy. Its purpose is to distract the opponent from the relevant facts and put him on the defensive to hide that the arguer really can't refute anything his opponent says.