The genuine refutation

"The genuine refutation must penetrate the opponent's stronghold and meet him on his own ground; no advantage is gained by attacking him somewhere else and defeating him where he is not"
- GWF Hegel, Science of Logic: Subjective Logic or The Doctrine of the Notion

Both the critics and supporters of Direct Instruction do not refute from within the others respective strongholds. That is why this quote has been playing on my mind for sometime.