Why is there content to censor in the first place? What has broken to cause that abhorrent content to exist (e.g. “shoot them all and let god decide what to do

Why is there content to censor in the first place? What has broken to cause that abhorrent content to exist (e.g. “shoot them all and let god decide what to do with them”) Why have they lost the ability of civilised communication? If that can be fixed or self-policed, the calls for censorship evaporate.