Unfortunately, I think it's a bit of a classical liberal ideal that "the truth will come through and those who were wrong will see the error of their ways".
To some, the truth is a tool. If it's not a useful tool, it will be discarded. Probably a more useful tool, like hyperbole, decontextualization, gross mis-interpretation, or just adding "new facts" will be used.
I think it's naive to say that laissez faire speech is going to solve all issues, just like it'd be naive to say that peaceful protests would be a viable path to democracy in North Korea.
(Personally, I'd like to see bias recognition, propaganda recognition, and the ability to shift perspectives taught. A dumb, noncritical society is going to do and say dumb things)