> Because at some point, at a certain level, society is built on at least some level of implicit trust. Without it you can't have a functioning society.

This is somewhat central to being remain anonymous.

Protesters and observers are having their passports cancelled or their TSA precheck revoked due to speech. You cannot trust the government to abide by the first amendment.

Private services sell your data to build a panopticon, then sell that data indirectly to the government.

Therefore, tying your anonymous speech to a legal identity puts one at risk of being punished by the government for protected speech.