the marshall plan was strictly so europe would stay loyal to the united states following the war. if the soviets hadn't been around, there would have been no need for it and europe probably would have stayed in the stone age following the massive bombing campaigns carried out during the war.
Americans also needed markets to sell their shit to, ones with money to buy it with.
Not that it was good but mid-century capital was a bit more forward thinking than now given the historical context, and looked beyond Q3 gains.