This is what democracy looks like

In my mind, the U.S. had been the country of freedom, where you can speak out whatever you have in your mind. However, what I saw in the movie “This is what democracy looks like” was totally different from what I thought the U.S. was. In the movie, people who were demonstrating against WTO suffered from brutal police force. Policemen used OC spray, violence and other many ways to stop them. Actually, I believe that there is a need for a country to stop the opposition when it is a threat to the country. People in the demonstration brought chaos to cities by breaking the public properties and making a lot of noise. Policemen, who are supposed to keep the peace and order in the country, therefore, needed to suppress riots. However, this gave me the question of “What is a democracy?”, “What is the difference between democratic countries and undemocratic countries when both of them do use the national forces to restrict the freedom of people?” and “Is it the degree of how much force do they use?”