I think it should be stressed that these ideas are necessarily flexible based on the quality of the thing being disagreed with. Basically, Paul's assumed that the post being argued against is ideal, and against that has built his hierarchy. In real life, an effective argument, in fact sometimes the only possible argument, against a poorly formed thesis is a poor response.
For example, the conclusion that, "a DH2 or lower response is always unconvincing" is not true in the following case: Suppose someone posited that there is a blue species of monkey living in the basement below the U.S. Senate and the only reason he gave for us to believe him is that he is a trustworthy U.S. Senator. In disagreeing with him, if we bring an ad hominem attack against his trustworthiness it is entirely acceptable and relevant because his trustworthiness is the only proof he's brought in the first place.
For example, the conclusion that, "a DH2 or lower response is always unconvincing" is not true in the following case: Suppose someone posited that there is a blue species of monkey living in the basement below the U.S. Senate and the only reason he gave for us to believe him is that he is a trustworthy U.S. Senator. In disagreeing with him, if we bring an ad hominem attack against his trustworthiness it is entirely acceptable and relevant because his trustworthiness is the only proof he's brought in the first place.
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