The time frame and how people treated each other was upsetting, but what's great about this story is that they really focus on the strengths of these people and the strengths of the culture, of who these Americans were. That, actually, is uplifting.
With any good projects, I feel like the off-screen chemistry factors on-screen. It's great when you don't have to force it, but when it's not there you better focus on getting there, because as we live with these characters we spend more time with one another than we do our families at home.