That’s right. Great intelligence in the hands of someone morally corrupt and evil can wreak great havoc in the lives of many people.
His successors created a mass pogrom of the Roman upper classes, just murdered them for their connections, also for their priceless knowledge of how the Republic worked, how to make the offices work, how to govern a province, how to finance political campaigns. Marc Antony and Octavian just butchered them -- starting with Cicero, and getting around to Caesar's assassins later.
People still think of Caesar as a big shot, but he was small where it counted.