A lot of the early (1789) revolutionaries were from the nobility and even the clergy. Many of the reactionaries were up and coming bourgeois who were about to make their way into the nobility. Sorry Marx, you got a few things right, but that one was an oversimplification.

The vast majority of the victims of the reign of terror were commoners. The nobility were underrepresented at the guillotine, besides a few obvious high-profile cases.

It appears as though Robespierre legitimately lost his mind at some point. He attempted to introduce a “cult of the supreme being” with himself as high priest that focused on adhering to his own idea of virtue. Anyone not virtuous enough, which was effectively literally everyone else, was liable to be executed.

Early in the revolutionary wars, the revolutionaries had arrested so many people that the Paris jails were super overcrowded. Some people didn’t want the armies to leave Paris for the front lines because maybe all those jailed people would break out and cause trouble. So Marat proposed that they reduce the incarcerated population… by killing them all. September 1789 was a bad month to have been a petty thief in Paris.

So many of the popular notions about the revolution are distorted or just ass-backwards.

People seem to forget that it almost immediately led to a military dictatorship