Why I choose to watch depressing documentaries whenever I'm hormonal is anyone's guess.
I'm glad this doc was made and aired on American Experience because, frankly, in the US we continue to ignore our eugenic legacy. However, because there are a lot of Americans who still, often unknowingly, hold to eugenic ideas, you really can't mince words when covering the topic. Unfortunately, the narration of this documentary does just that. Fortunately, the interviewees are more direct in their discussion of these ideas.
There's also a moment early on where, in the voice over, they present a later misinterpretation of Charles Darwin's work as Darwin's work. They also fail to mention the Chinese Exclusion Act when talking about immigration laws later in the documentary. So, if you decide to watch, please keep those things in mind. TBH, you should listen to some of Stuff You Missed in History Class' podcasts on these topics instead.