By your very own logic, I could argue that dictators have more carte blanche to make correct choices, where democracies are mired down by compromises and too many cooks in the kitchen.
Going to war and killing people is "a mistake". Let me rephrase it for you:
The fact that democracies are the same murderous criminal fucks when it suits their goals as are dictators. Yes the have more problem having their population to approve it but do they give a flying fuck?
Any form of government is going to make mistakes.