That’s to keep you from having to scroll past several pages of comment explaining the whole issue all over again in the thread. It’s more convenient for you to just click a link if you doubt the claim, and then you can see the argument I would have otherwise typed in the thread. It’s easier for Me as well.

When arguing with tankies on this site, I often wish they would take the same approach, instead of either writing a 4 page comment, or citing the entire works of Marx. It allows the reader to choose which arguments to further engage with, and saves time for everyone.