I have a friend who loves golf. He takes his little nephew to the driving range sometimes and he teaches him how to hold a golf club, how to swing one, etc. My friend has been keeping a journal of each of their outings over the years and he plans to give it to him some day. Can you imagine how that is going to make his nephew feel? He's going to know his uncle loved him enough to jot down the events of every outing he took with his uncle when he was young. He certainly won't feel cheated due to the fact that his uncle didn't mention any frustrations he might have felt at the time about how disinterested his nephew appeared on one particular outing or how rude somebody in the pro shop may have been. Those things probably won't even cross my friend's nephew's mind as he reads the entries.
When we are fortunate enough to get the opportunity to read somebody's journal from a previous generation, there is an assumed level of censorship going in. But that doesn't make the reading any less interesting or relevant.