PARIS — The banks of the Seine were still cloaked in early morning darkness when a security guard at the Paris Holocaust Museum, seated just a stone’s throw from the Notre Dame Cathedral, noticed a suspicious scene. Two men in dark clothes were spraying red paint across the Wall of the Righteous — a stone monument inscribed with the names of those who saved Jews in France during World War II. As the guard gave chase, a third man emerged from the shadows of a nearby building to film the night’s