Why was Jacques-Louis David called the Robespierre of the brush?

Jacques-Louis David was nicknamed "the Robespierre of the brush" because of his role as the virtual art dictator of France in 1793.1

During the French Revolution, David was a committed member of the extremist Jacobin group led by Maximilien Robespierre. As a member of the art commission, David wielded significant power, which he used to abolish the Académie Royale and dismantle the existing system of artistic training and patronage.1

His influence extended beyond policy; he acted as a politically committed artist who used his position to preach moral and aesthetic sermons to the National Convention and produce revolutionary propaganda, including festivals, funerals for martyrs, and iconic works like The Death of Marat.1