Why do you think he calls the act a military necessity in the last solution?

He likely refers to the act as a "military necessity" to justify actions taken under the guise of urgency and strategic advantage during a conflict. This terminology can be used to rationalize decisions that might otherwise be seen as unethical or excessive, framing them as essential for the greater good or survival of a group. By using this language, he seeks to legitimize controversial choices and mitigate backlash by portraying them as unavoidable in the context of warfare.