This is not very different from when you decided to buy a decent quality product made in China when you could have bought a slightly better quality product made in USA for 2X or 3X the price. I'm obviously guessing here to be more dramatic, but the point is true in general.
Cost has always been a major factor in many decisions we make as individuals or organizations. And for a company (which has fiduciary duty to its shareholders), cost is definitely a more important factor than being able to hire Americans.