Why are Libertarians using the slogans, catchphrases and language of those espousing Marxism?

Links referenced are as follows:
https://www.jo20.com/
https://blogs.ams.org/blogonmathblogs/2020/06/21/what-does-anti-racist-mathematics-look-like/
https://clemsontigers.com/tigers-unite-resources/
https://nmaahc.si.edu/learn/talking-about-race/topics/being-antiracist
https://abcnews.go.com/US/nascar-announces-ban-confederate-flags-races-events/story?id=71182898
https://www.cnn.com/2020/06/09/us/confederate-statues-removed-george-floyd-trnd/index.html
https://www.nytimes.com/2020/06/14/us/politics/black-lives-matter-racism-donations.html