Obvious as it may sound, people with authoritarian beliefs hiding behind free speech actually consider it as a weakness akin empathy. It allows losers like them to amplify their reach despite not being in power. They abandon their “free speech absolutist” postures the moment they think they are in power.
You don’t need to be an “absolutist” to believe in free speech. Open exchange of ideas is valuable. Not needing to be suspicious of everyone hiding what they really think out of fear is valuable. Censorship powers are very tempting to abuse and the consequences of their abuse are terrible, therefore they should be strictly limited. Believing in free speech can just be understanding this stuff and having a bias against shutting people up as a go-to solution.