Good point.
Additionally, complexity also scales. A dictatorship relies more on the common sense of the dictator while a democracy relies on a set of written laws that grows with complexity over time. A single party does not need a contract while at least two parties must engage in a contract called a written body of law in order to come to an agreement. This "contract" is edited and amended over time with no limit to how complex it gets.
In fact, that complexity balloons to a point where only experts can understand the law (lawyers). It also grows to the point where the law is so complex that it can become internally inconsistent and develop loop holes that do not serve the original intended purpose of the law.
This allows for entities to exploit these loop holes. Of course only entities with enough money to afford the "experts" to find the loop holes and exploit them will be able bend the laws to their advantage thereby causing only the rich and elite to become more powerful.
The above is the basic theory about the anthropological progression of your typical democracy. Growth in complexity of a body of law to the point where only the elite can afford to hire specialists to take advantage of said law.
That is the main danger of democracy. Excess Complexity to the point where only people who can afford specialists to change the law can exploit it to their advantage. Complexity of law also leads to all kinds of other phenomena that niche experts and common people can take advantage of as well. For example constructors that take advantage of property law.
The scary thing about the theory above is that there is a TON evidence of this. Almost every modern democracy in the world suffers from ALL of the problems above. Literally find me one that doesn't.