As this is being written, Donald Trump is the last surviving Republican presidential candidate. His final opponents, Cruz and Kasich, suspended their campaigns, though perhaps visions of a contested convention still haunt their dreams.
Cruz left the field of battle with a bizarre Trump arrow lodged in his buttocks: Trump had attacked Cruz by alleging that Ted Cruz’ father was associated with Lee Harvey Oswald. The basis for this claim was an article in the National Enquirer, a tabloid that has claimed Justice Scalia was assassinated by a hooker working for the CIA. While this tabloid has no credibility, the fact that Trump used it as a source necessitated an investigation into the claim about Cruz’ father. As should be expected, Politifact ranked it as Pants on Fire. I almost suspect that Trump is trolling the media and laughing about how he has forced them to seriously consider and thoroughly investigate claims that are utterly lacking in evidence (such as his claims about televised celebrations in America after the 9/11 attacks).
When confronted about his claim about an Oswald-Cruz connection, Trump followed his winning strategy: he refused to apologize and engaged in some Trump-Fu as his “defense.” When interviewed on ABC, his defense was as follows: “What I was doing was referring to a picture reported and in a magazine, and I think they didn’t deny it. I don’t think anybody denied it. No, I don’t know what it was exactly, but it was a major story and a major publication, and it was picked up by many other publications. …I’m just referring to an article that appeared. I mean, it has nothing to do with me.”
This response begins with what appears to be a fallacy: he is asserting that if a claim is not denied, then it is therefore true (I am guessing the “they” is either the Cruz folks or the National Enquirer folks. This can be seen as a variation on the classic appeal to ignorance fallacy. In this fallacy, a person infers that if there is a lack of evidence against a claim, then the claim is true. However, proving a claim requires that there be adequate evidence for the claim, not just a lack of evidence against it. There is no evidence that I do not have a magical undetectable pet dragon that only I can sense. This, however, does not prove that I have such a pet.
While a failure to deny a claim might be regarded as suspicious, not denying a claim is not proof the claim is true. It might not even be known that a claim has been made (so it would not be denied). For example, Kanye West is not denying that he plans to become master of the Pan flute—but this is not proof he intends to do this. It can also be a good idea to not lend a claim psychological credence by denial—some people think that denial of a claim is evidence it is true. Naturally, Cruz did end up denying the claim.
Trump next appears to be asserting the claim is true because it was “major” and repeated. He failed to note the “major” publication is a tabloid that is lacking in credibility. As such, Trump could be seen as engaging in a fallacious appeal to authority. In this case, the National Enquirer lacks the credibility needed to serve as the basis for a non-fallacious argument from authority. Roughly put, a good argument from authority is such that the credibility of the authority provides good grounds for accepting a claim. Trump did not have a good argument from authority.
Trump also uses a fascinating technique of “own and deny.” He does this by launching an attack and then both “owning” and denying it. It is as if he punched Cruz in the face and then said, “it wasn’t me, someone else did the punching. But I will punch Cruz again. Although it wasn’t me.” I am not sure if this is a rhetorical technique or a pathological condition. However, it does allow him the best of both worlds: he can appear tough and authentic by “owning it” yet also appear to not be responsible for the attack. This seems to be quite appealing to his followers, although it is obviously logically problematic: one must either own or deny, both cannot be true.
He also makes use of an established technique: he gets media attention drawn to a story and then uses this attention to “prove” the story is true (because it is “major” and repeated). While effective, this technique does not prove a claim is true.
Trump was also interviewed on NBC and asked why he attacked Cruz in the face of almost certain victory in Indiana. In response, he said, “Well, because I didn’t know I had it in the grasp. …I had no idea early in the morning that was — the voting booths just starting — the voting booths were practically not even opened when I made this call. It was a call to a show. And they ran a clip of some terrible remarks made by the father about me. And all I did is refer him to these articles that appeared about his picture. And — you know, not such a bad thing.”
This does provide something of a defense for Trump. As he rightly says, he did not know he would win and he hoped that his attack would help his chances. While the fact that a practice is common does not justify it (this would be the common practice fallacy), Trump seems to be playing within the rules of negative campaigning. That said, the use of the National Enquirer as a source is a new twist as is linking an opponent to the JFK assassination. This is not to say that Trump is acting in a morally laudable manner, just that he is operating within the rules of the game. To use an analogy, while the brutal hits of football might be regarded as morally problematic, they are within the rules of the game. Likewise, such attacks are within the rules of politics.
However, Trump goes on to commit the “two wrongs make a right” fallacy: since bad things were said about Trump, he concludes that he has the right to strike back. While Trump has every right to respond to attacks, he does not have a right to respond with a completely fabricated accusation.
Trump then moves to downplaying what he did and engages in one of his signature moves: he is not really to blame (he just pointed out the articles). So, his defense is essentially “I am just punching the guy back. But, I really didn’t punch him. I just pointed out that someone else punched him. And that punching was not a bad thing.”