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Well let me explain it you with an example. Let's say that it you are living with a roommate in house you have rented together. One day you return home after a bout of torrential rains a notice that your roof is leaking. You confront your roommate with this problem but he disregards your comments and refuses to pay his fair share to repair it..
You let it go this time as you are tired and decide to confront him in the morning again. Come next morning you once again ask him to pay his fair share and to solve the problem of the leaking roof. He looks you dead in the eye and says that there is no leaky roof. Even after you point out the leak to him he refuses to acknowledge that there is in fact a leak. Eventually your roommate gives in and the problem is solved. Now imagine if the same situation had occurred but you didn't have the right to point out the leaking roof. Would the problem of the leaking roof have been solved? Or would your roommate have just continued to ignore the problem?
Now imagine the same happening on citywide or countrywide scale. Would it still be acceptable to not point out the leaking roof?
Does that mean though, that we must allow all kinds of speech without any regard for the consequences of said speech? Of course not. Then there must be some common sense restrictions that must be put in place to maintain civil decency in a free society.
Let's discuss them now.
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For example child pornography that cannot be created without the abuse of children as a precondition is not under the purview of the freedom of speech. This however does not include doujinshi that include only drawings made out of purely the imagination of it's creator. Because when this is blocked, historically it is noted that the restrictions are then seamlessly extended to anime and manga and even cartoons that may be considered in the subjective opinion of prudes and moral authoritarians to be perverse and degenerate. This as such also puts a limit to the creativity of others and artists, therefore infringing on their freedoms and preventing the progress of human civilization even if by just a little bit.
Secondly, calls to violence should also not fall under the purview of free speech. Now it is important to clearly delineate as to what constitutes a call to violence. In my personal opinion a call to violence is only classified as such if it includes specificity. For example, consider the phrase "Kill all men". In general this would be considered a call to violence but as this phrase is lacking in the specificity of time, place, method and the conditions under which the violence must occur or even the relevance of the comments to the topic at hands or it's context in the situatiion, I would like to put it under the purview of the freedom of speech. On the other hand, the phrase "Kill all men tomorrow!" or " Kill all men in London" would be considered a call to violence due to the specificity of the statements.
David Rawson, the US ambassador, said that its euphemisms were open to interpretation. The US, he said, believed in freedom of speech. The radio told people to go to work and everyone knew that meant get your machete and kill Tutsis. Many Rwandans, however, knew the threat. ‘I listened to RTLMC’, said a survivor, ‘because if you were mentioned over the airways, you were sure to be carted off a short time later by the extremists. You knew you had to change your address at once.