You don't see how controlling two sides of a debate in order to narrow the possible modes of thought in regard to the topic is relevant to the idea of the Hegelian Dialectic?
No. If anything the idea of the Hegelian Dialectic is to broaden the mode and content of reasoning by avoiding rhetoric, considering the antithetical viewpoint and reconciling it all with an objective (as much as possible) analysis. It is explicitly anti-rhetorical and pro-reason, whereas the kind of manipulation you are describing relies almost exclusively upon rhetoric and the subversion of reasoning.
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