This looks to me like a classic correlation-causation mistake.
* Discussion a book with mass hangings can lead people to talk about gallows.
* Going to a political protest can traditionally involve bringing a gallows.
They are not linked, even though both things involve a gallows. Political protest commonly involves nooses (here is a really good one [0]). That is totally normal symbolism after a US president is voted in.
[0] https://www.cbs17.com/news/kentucky-man-hangs-effigy-of-dona...