France has endured its most destructive wildfire season since the Second World War, with 300,000 acres lost to blazing forests. The government has detained 420 suspects linked to deliberate or accidental ignition, 166 of whom are minors.

A 23‑year‑old man is on trial for igniting 10 fires in five days and could face 15 years in prison plus a 150,000‑euro fine. A firefighter was sentenced to three years after starting three fires in the Vosges.

Critics argue the arrests are excessive, citing cases of a homeless man and a person with autism jailed for tossing cigarette butts. Lawyer Muriel Gestas, who has represented arson defendants, told Le Monde “I was amazed at the number of arrests; it feels excessive”.

Investigators map fire outlines to trace origins. Officer Eric Dufayet explained that in droughts a simple lighter can spark a blaze; he described the “30” rule, requiring temperature ≥30°C, humidity ≤30%, wind <30 km/h, and at least 30% of a cigarette unburnt.

Most fires are accidental, from cigarettes, barbecues, construction work, or equipment faults. Pyromania—emotional arson—remains rare, yet some suspects may have financial motives, including insurance payouts or volunteer tax‑free overtime.

President Emmanuel Macron warned that the next heatwave is imminent, urging replanting of forests to adapt to climate. He stresses unity while acknowledging the need for future policy reviews. The public remains concerned about loss to homes, tourism, and air quality.