There are two levels on which something can be valid: subjective and objective. Which one is more important? Both are important, but objective validity is more important.
The importance of each varies depending upon the purpose and the audience.
Both are important, but subjective validity is more important.

Why did orson welles change the beginning of the war of the worlds for his radio broadcast? a. to capture the attention of his listeners, who may have been doing other things b. to get around copyright laws associated with using material from a published book c. to ask members of the audience to call family and friends and encourage them to listen d. to remind listeners to call police for more information