>So you're saying they are just sheep and do things blindly?
No. Not only did I not say that, there's no reasonable way to infer that from my comment, and your doing so demonstrates an unwillingness on your part to argue in good faith.
That people are influenced by more than purely logical, didactic arguments should be self evident, nor does that fact make people sheep, it's simply human nature. We're not compilers, after all, we're primates with countless irrational biases hard wired into our brains. Anti-vaxxers, COVID-denialists, flat-earthers, conspiracy theorists of all stripes, the resurgence of discredited white supremacist and anti-semitic ideology under the politically correct guise of "racial realism" and the phenomenon of fake news spread by social media should be enough to demonstrate that falsehood can be more compelling than fact, and that facts alone are not sufficient to dissuade such people from their false beliefs, or stop their influence.
>The real changes, the ones that lasted generations, the things that made America truly great, were done because free speech convinced people to change their minds.
No they weren't. They were accomplished with speech and consequence, often long, violent, ugly protests and frequently civil unrest. America has only ever granted its inalienable rights to white Christian men by default - everyone else has had to fight tooth and nail for their seat at the table and for every scrap of human dignity they could take from the cornucopia of American liberty.
Women's suffrage was earned with speech and blood. African American rights were earned with speech and blood. LGBT rights were earned with speech and blood. Even recently, few outside of the black community really cared about systemic racist violence among the police, despite the black community speaking at length about it for years until they also started taking to the streets and burning shit down... then suddenly everyone else noticed and started listening.
Speech without the force of consequence is as useless as a toothless guard dog.