Try re-reading my post #29; a direct response to your justification of censorship
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By having an attitude that there are acceptable reasons to ban books [your example: calling for violence] disregards a very important principle: You thereby attempt to censor ideas.
We already do that. As we have discussed, conspiracy is a crime. If you talk to someone about committing a crime, that can be a crime. There are also libel laws etc. So pretending like you are always free to say what you want is a lie.
You may not like those ideas, therefore, let's eliminate them? No.
Any real political or personal philosophy can be discussed without calls to violence. If you cannot discuss your ideas without calling for violence, then it probably isn't the ideas that are the problem, it is the author.
You create civil legislation that violence that results in the loss of life or property of another is illegal. Does this legislation work in 100% of cases? No. What if it only deters 10% of people? Do you decide that's not good enough, so ban the provocation of ideas? NO!
If I understand correctly, your point is that we should do nothing to prevent crime and only try to punish people after it occurs? Your point appears to be that doing anything to try to stop people calling for crimes and violence is immoral, and we should only punish people after the violence has already happened. That doesn't help the victims. And it certainly doesn't help society to allow violent extremism to flourish.
What do you think democracy is? That everyone agrees with one another? That forcing everyone to think the same way is democratic?
no one is forcing anyone to think the same way. We as a society have the power to decide what is and is not acceptable. I would hope that in a democratic country we agree that using violence to get your way is not an acceptable solution. That is why we have democracy, so that you can vote for the change you want. Therefore, why would we allow people to advocate for using violence?