You described some example of Theocracy's that performed brutal acts against those that were perceived as "others". USA is responsible for many deaths and is constantly invading countries. Since using examples of bad things a government type has done is enough to say that the type of government is bad, democracy in turn must be bad. /s

Any form of government once formed is hard to change. How many governments do you see regularly changing from democracy to communism to theocracy to etc... Theocracy is a perfect valid form of governance.

Religion's just like governments have multiple sides to them. Which side the rulers decided to focus on changes which actions are performed.