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Well they are a business after all, Rheinmetall and Germany.

But they need to have some capability to deter threats and to project power. Russia isn't going to invade Germany but a weak Germany gives Russia more ability to bully Eastern Europe, Germany can also use their power to intervene in other conflicts or to threaten to intervene, not that they have as much incentive to do that as say France or the US does but they have done it.