A lot of the best science fiction uses futuristic/fantastical settings to talk about contemporary issues
You might not need a history lesson, but a lot of kids know nothing about that event:
https://www.bbc.co.uk/news/newsbeat-45939324
Maybe, just maybe, I have become a hardened cynic in my old age but the first twitter message on that link, about how her 14 year old son shed a tear at the end of the episode seems, I don't know. BS? Hyperbole? Exaggeration? I couldn't imagine a 14 year old boy shedding a tear over that episode.
Now there are possibilities here...
1) I was just a nasty 14 year old myself and didn't cry over an episode of Doctor Who, no matter the content.
2) I've become cynical in my old age and don't believe that 14 year old boys in 2018 are quite as ....shall we say, sensitive..as that.
3) The 14 year old boys that I know from my local schools are just nasty and tougher than the norm.
4) Marcia Layne completely made that part up in her twitter post
5) Marcias 14 year old son is very in touch with his emotions
I'm guessing that its me who is the one with the emotional issues, so I'm assuming that its a combination of 1 and 2 , rather than it being an untruth