A big reason why you see white people with foreign kids is because they are much easier to adopt than American kids. Less time to go through the process and what not when they come from third world countries. I'm sure there's always people with sinister reasons but I know that in her case, she wanted kids and her husband didn't. Which is why she got divorced and adopted them on her own.
I'm not against giving a child a good home. But it's always a challenge when you try to raise the kid to ignore societal biases, discrimination, and expectations.