They'd be threatening the balance of power by dismantling France. The issue is how are they supposed to dismantle it, exactly? Split it into smaller independent states? Grant territory to the victors? By this point in time France had, what we'd consider, national and ethnic borders. No one really had any serious claims on French lands, and so, giving territory away is a blatant land grab of a modern European state. What's to stop Russia from annexing chunks of Prussia or Austria if any European nation is free real estate?
Likewise, where does the territory go? If you split France, then the smaller nations will inevitably look to reunite. Give land to Prussia? That just tips the balance in Prussia's favour. What about Britain. They were too worried about their colonies to dabble on the European continent. France isn't Poland. France is wealthy, populous, and fertile. French lands, given to any nation, could raise them above the other great powers. What about Russia? Why does Prussia and maybe Austria only get territory?
What about the Bourbons? The war wasn't against France, it was against the revolution. What message does taking land from a European monarchy send to the world?