If they were left up after being grayed out by serial downvote abusers, they would be currently and visibly duplicative and easier for people (like yourself) to call them spam.
I am not really interested in your advice as to how to run my blog. Please cease and desist.
If you were really interested in the right thing you would join in calling for an end to serial downvoting by people who do NOTHING for the site but downvote others they disagree with, ideologically. That is a blatant form of censorship that can only be slightly combated by reposting.