From Smithsonian citing PNAS : My bold font. 5% campfires includes 'children playing with fireworks or matches' [how does that make sense?]...but considering that a campfire prohibition is a nice easy stroke that appears to stop wildfires it makes folks feel safe since those at the helm are doing something meaningful.
"Rice reports that debris burning starts the most human-caused fires, at 29 percent, with arson the cause of 21 percent of fires. Equipment use causes 11 percent of fires, while campfires and children playing with fireworks or matches each cause 5 percent of fires. The Fourth of July, predictably, is the biggest day for wildfires, with 7,762 fires ignited on that date over the 21-year study period."