This "we, >smart< people will be able to >illegally< disable these artificial barriers, but those >old aged dumb people< will and should not" plan is not really a good setup for enforcing a "democratic" order. It is a much more authoritarian and naive approach, and a similar system is what led to the recent rise in social bubbles, conspiracy and fascism. For a more specific example, it made western society believe racism was a solved case since the 80s, because us, "smart people" controlled the mainstream discourse.

Absolute and true freedom of speech, with all its drawbacks and legal greyzones needs to exist.