You aren't asking a moral question. You are asking a legal question. If Al Qaeda or ISIS were to post on Steem making threats then what should any US company do which runs a front end to the blockchain?

Either the US company cooperates with law enforcement or the US company cooperates with the terrorists. When the FBI, Secret Service, DHS and others knock on your door are you going to go to prison or risk lawsuits in order to protect a group which likely would just as easily hurt you as it would hurt the US government?

Legally we should assume and expect any US company run by a US citizen to comply with US law. If we want decentralization then non US companies can offer front ends to the blockchain but those companies we should expect to comply with their local laws.