Because of its traditional European balance of power policy, Britain is very wary of France's behavior, fearing that weakening Germany too much will make France bigger in the European continent. Neither the wily Britain nor the United States, which entered the world stage for the first time with the dream of dominating the world, can tolerate this.
Moreover, after the October Revolution, Soviet Russia believed that socialism could not be built in one country, so Lenin and Trotsky were keen on exporting revolution to Europe. From 19 18, Germany's home court was a mess. In Berlin, an engineering Soviet similar to the Soviet Union has been established, and in Munich, the Soviet Union was simply established. Germany is on the verge of turning red. If Germany is executed like France, then Weimar, China and the Social Democratic Party in Germany are likely to fall into internal and external troubles like the Russian bourgeois provisional government, and finally be overthrown by the revolution. Such a result is absolutely unacceptable to Britain and America. Therefore, they do not advocate excessive liquidation of Germany.
One more thing. After the war, Britain and France and other allies owed a lot of debts to the United States. After the war, the United States blindly forced debts, while the allies had hoped to earn foreign exchange in trade with the United States after the war to repay American debts. As a result, the United States passed the Smoot-Hawley Tariff Act and erected tariff barriers, but European goods could not be sold in North America. Europe has just got up from the blood pool of war and its consumption is sluggish. If you can't export, there is no way out. Therefore, Europe has also begun to engage in tariffs and other non-tariff trade barriers. In the face of the customs union between the British Empire and the French colonies, American exports and investments in Europe were also blocked. So Germany after the defeat was brought into the eyes of the United States. Before World War I, the United States relied heavily on German chemical products. After the war broke out, the supply of goods was interrupted, which made the United States very uncomfortable. After the defeat of Germany, although the finance collapsed and the economy was on the verge of bankruptcy, Germany's scientific and technological advantages still existed, but it was just short of money. The United States is drooling over German technology, especially chemical technology. So after the war, American capital poured into Germany like a flood after World War I, and the United States exchanged its capital investment for a large number of industrial technologies in Germany, while Germany was faced with huge reparations from the allies and could not bear it. In order to rely on debt, the German government deliberately indulges in hyperinflation, but this will harm the interests of the United States. This is why the United States has to come forward to engage in the Dawes Plan and the Young Plan.