A democracy is a system of government in which the power lies with the people. This system is good for promoting peace as the body politic is not likely to engage in a war in which members of it may be killed and their property destroyed. It is also the best system for taxation, provided everyone enters into a debate about taxation with fairness and with the interests of the government at heart instead of their own. In a democracy, human rights are best protected but only if the members of a democracy are not prejudiced against a certain group. A democracy, though often unwieldy and incapable of making quick decisions, is the best form of government for giving the people the most rights and the best possible outcomes.
Globally speaking, if more countries maintained a democratic government then fewer conflicts may happen. Democracy lessens the likelihood of rash decisions because of the checks and balances used in making decisions. All citizens help to make decisions in the broadest sense but even at the top, no one person has all the control.
Additionally, democracy helps to insure everyone's freedom. Citizens have freedom of speech and religion for example. Democracy helps to insure that the government and its decisions represent the people because of the system of voting that elects officials. Additionally, these votes and decisions are made public so that all citizens know how and why laws and policies are made. Human rights are more likely to be respected and promoted within a democratic society as well. Because of the freedoms that democratic governments insure, citizens feel free to speak up for the rights of others and in so doing, they help insure that human rights are protected.
The main point in favor of democracy is that it provides the greatest amount of freedom. In a democracy, people have freedoms such as the freedom of speech and the freedom of religion that tend not to be available to them in other forms of government.
A second major point in favor of democracy is that it is less prone to catastrophic errors than other forms of government are. Democracy makes use of the "wisdom of the masses." The mass of people are not infallible, but they are less likely to make horrible mistakes than individual leaders or small groups of elites are. Dictators and governments where only a very few have power are much more likely to do things that are terribly harmful than democracies are.