In response to this question, Was Saddam ever a US ally? , a poster made misleading claims.
When I pointed this out in a comment, they posted a bunch of obstructionist responses, full of non sequiturs, misrepresentations of my posts, making up new definitions of terms, claims that their position was obviously true and that it needed no defense beyond just telling me to educate myself, and finally calling me a troll for continuing to ask for citations. When I flagged their comments, the entire comment thread was deleted, but their answer remains.
This seems like an odd response to incivility. Be rude, and your answer will be purged of dissenting comments? What is the thinking behind this action? Are there any consequences for engaging in this sort of behavior?