Final answer:
The main issue with the argument is that the premises do not adequately support the conclusion, and there are alternative arguments with equal or greater support.
Step-by-step explanation:
According to the passage, the main issue with the argument presented is that the premises are inadequate to support the conclusion. The argument is criticized for having premises that are either false or questionable and thus cannot adequately lead to the asserted conclusion. Additionally, alternative arguments that are equally or more supported are present, which weakens the strength of the original argument. Furthermore, it is important to note that the truth of the premises is not sufficient, as they must also be relevant and logically lead to the conclusion to form a valid argument.