I no longer believe this, when cesspits of alt-right, racist assholes use such grandiose ideals to spread their hatred, which then bubbles out into the real world.
The idea that good ideas will win, and that common sense and rationality will take the day, are not really supported by what we see around the net. Instead the greater internet fuckwad theorem holds more true, and the spread of vile, violent ideologies is enabled.
Freedom of speech is a protection from government, but I think those providing speech platforms, such as hosting companies, should probably take more responsibility for what they propagate.