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People have a right to information and the government should not and can not be trusted to decide what information we can see
Sometimes it may be necessary. Let's say, there are two societies. One society can greatly influence another society by means of informational impact on the other society - it will just flood the other society with the misinformation and thus influence the internal processes of that society.
Censorship is horrible, but it's hard to prevent online therefore people aren't trying as hard to censor it anymore.
Governments need the ability to detect, monitor, and control illegal acts taking place online, such as the e-transfer of funds to a smuggler's bank account. Mechanisms that can censor individual transfers of information are essential to finding and preventing crimes in evidence-based justice systems
Bob wants to kill Alice. Bob takes the remote controlled tank from Charlie. Bob drives the Tank to the house Alice is sleeping in ready to fire but Bob forgot what button to press to fire. He asks Charlie who answers via eMail.
What about child pornography?
Sometimes it may be necessary. The major part of information is getting to our mind unconsciously. Some of it (or even the major part of it) can be excessive or even harmful.
Let's say, marketologists can exploit our psychological needs (rooted in our genes) to stimulate some behaviour.
Bob sends compuer viruses via email to old people the govement knows it and they could censore his emails that contain the virus.
in that case it would be ethically right to censore Bobs email.
Not ethically wrong in every form. Censoring information that has a great chance of producing harm to the individual or other humans upon learning it can be justified. However this is dangerous slippery slope, and something like a popular vote should be required to enact it.
hindering someone for calling X and telling him Y is (indirect) censorship
but calling 911 and telling them "i just call to block the line for real issues lol" gets punished (hindering indirect) and it is ethically right to do this