why did sir percy blakeney risk his life and the lives of his men to save the french aristocrates

This uprising is often seen as a radical manifestation of the egalitarian principles of the Enlightenment. As a result of this uprising, a Reign of Terror took hold, where aristocrats were condemned, imprisoned and sent to the guillotine. In Orczy's novel, a masked hero known as the Scarlet Pimpernel rescues those aristocrats trying to flee the gates of Paris and takes them safely to England, where they enjoy diplomatic immunity from the terror of the masses. Percy is seen as not a supporter of the French Monarchy more than a protector of women, children and the helpless.