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Re:Molecular biology clues portray SARS-CoV-2 as a lab manip... by chmod600 on Sunday May 30, 2021 @09:05PM (#27338756)
"Valid ad hominem arguments occur in informal logic, where the person making the argument relies on arguments from authority such as testimony, expertise..."

https://en.m.wikipedia.org/wiki/Ad_hominem

It appears that the original comment was valid ad hominem, but still ad hominem.

Re:Molecular biology clues portray SARS-CoV-2 as a lab manip... by parineum on Monday May 31, 2021 @11:14PM (#27350388)
Any ad hominem cannot inform you about the quality of an argument. It _can_ inform you that you should look at an argument critically but, even in the "valid" form, it doesn't address the argument.