The documentary premiered at Alsop High School in front of a packed audience on Thursday.
The writer PJ Smith, who also attended the school, said he felt “protective” of Walton.
“I didn’t want the rest of the country to think that it wasn’t a safe place to be when I knew different,” he said.
“From feeling anger, but then feeling like something good has to come out of this.
“And the library’s been rebuilt through the kindness of people.
“I hope lots of people get to see this film and see that that night did not really represent the people who have grown up here.”