eh. this feels infodump-ish and (slightly) forceful when the "didactic" part begins. I wouldn't be surprised if it had the opposite effect for the intended public (aka someone who has no idea of these issues, or even opposes them).
the result is positive, as long as it has made one person empathize and understand, but a more careful pace and approach could've been better (imo).

well, and the language Sam and company use feels a bit stiff and... thought to be read? especially with Melissa or Alice. not how I would communicate with friends, at least.