I think there is no boundary to free speech. Though they may be such a thing as hate speech, which is forbidden in Germany (where I live) for historical reasons, I don’t think hate speech should be forbidden.
Hate speech should be fought with tooth and nail, but not forbidden. Speech is to be fought with speech and experience; better speech and better arguments, but also personal experience.
You can say anything you want to. If I disagree with you, it is up to me to say my piece in a way that will kill yours. KILL! Let the better argument win, and yes, I don’t want my argument to kill yours, that was just a joke, but it is important to realize that arguments can win or lose. If you have a good argument, make it win!
Why? Because speech is thought expressed. You may try to forbid it, but you can’t get inside of peoples heads (not yet, at least). What people think will be expressed, and you simply have to deal with it. Supressing it will not help in the least, it will simply drive it underground and get it out of sight. Bad.
Of course, this assumes that you are able to understand my arguments, which, if we want to be honest, won’t always be the case. People who read this blog will probably be more receptive to cogent argument (I hope…), but people who read this blog are not typical people. Typical people aren’t used to analytical thought, and, after thousands of years of getting along, they are not about to start with that shit now.
I think it is important for you, the people who read this blog and understand it as it is meant to be understood, to realize that you are not typical. Most people just don’t get it, or, even if they could and actually wanted to do so, do not read this blog or other sources of information that might help them along the way.
Nevertheless, free speech is the only way to go. The opposite would be to assume that arguments shall not prevail, but rather power, or ignorance (which can only be fought with, you guessed it, free speech).
Whether it be the power of the state, as in Germany, which forbids certain types of speech, or the power of society, which forbids certain types of speech with the threat of ostracization, or even incarceration, depending on the momentary societal situation, the only way to fight it is with good arguments. Or experience.
Personal experience is very important. For example, a simple person (forgive me for saying it, but there are human beings who are “simple”, without having any less “worth” than anyone else) can benefit hugely from experiencing different cultures. It’s a very simple thing, which, perhaps, seems natural to any university student at a big campus, or to anyone who lives in an international city: seeing and meeting people from different cultures. Talking to them! Sitting next to them! Oh my God!
I think you have to realize that this is something that the greater part of humanity is not used to. As soon as you get them used to it, well, they’’ll get used to it. Christ, it’s that simple, sometimes. Put a right wing asshole next to a left-wing black man for half a year, and he will (perhaps) realize that the black man is of course a perfectly normal human being (they might even, God forbid, become friends).