What makes arsonists start wildfires?

Firefighters work as the Cranston Fire burns in San Bernardino National Forest on July 26, 2018 near Idyllwild, California. Fire crews are battling the fire in the midst of a heat wave.
Firefighters work as the Cranston Fire burns in San Bernardino National Forest on July 26, 2018 near Idyllwild, California. Fire crews are battling the fire in the midst of a heat wave.
Mario Tama/Getty Images

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The man accused of starting the Cranston Fire in Riverside County is one of hundreds of arsonists who set wildfires in California every year. Who are these (mostly) men, and why do they do it?