Because generally the right isn’t for free speech, just the free speech that supports their perspective. They’re literally defunding public libraries as we speak.
I know tons of people from both political spectrums who are pro-free-speech. I also know people who support free-speech that only supports their views. Nonetheless, you are correct in that there are right-wingers who are hypocrites by claiming to be pro-free-speech but then defunding libraries. Many on the left do this too, unfortunately. They claim to be for freedom but then advocate for the censorship of "misinformation" - a term that is currently being twisted to fit different political agendas.