The flags, which measured four feet by six feet and sat atop an eight-foot pole, had been planted near the veterans mausoleum at Forest Lawn cemetery in Anderson, South Carolina
Police say suspect was arrested for burning an object in a public place with the intent to intimidate.
The video used 43 of 143 words from an audience member's question, and only 24 of 615 words from O'Rourke's answer.
Donzella James apologized after she shared a Facebook post on the D-Day anniversary comparing the symbolism of the U.S. flag to Ku Klux Klan members burning crosses.
The blaze spread over five acres.