Where evidence is provided which undermines the credibility of the author, this does not qualify as an ad hominem attack. The parent provided relevant backgrou

Where evidence is provided which undermines the credibility of the author, this does not qualify as an ad hominem attack. The parent provided relevant background as to why one should doubt the author's objectivity. Simply playing the "ad hominem" card is not a free pass for the opinions of crackpots to be given equal weight.