[masswerk]

Regarding slippery slopes, the problem here is the personal unity of enforcing gatekeepers and the providers of communication technology, who become by this effectively sovereign entities. This is much like what had happened in Europe in the 19th century with state control(1) and which eventually resulted in the civil/liberal revolution.

Arguably, measures of a state of emergency are best left to the sovereign state, which is kept in bounds by the constitution and an elaborate system of checks, which arose because of these exact problems.

Edit: (1) Meaning, nationalized, now state controlled postal services in combination with sovereign censorship were, apart from taxation, how most citizens were confronted by the state on a practical level, often so for the first time. Most of our ideas of civil rights resulted from this confrontation.