Why is people's movement restricted?

I have watched a lot of news about rallying groups of people, may it for additional salary or to expose authority of their wrong doings. These rallies, in my opinion, is to get the sympathy of the masses and the support of the government for their causes. Of course, no rally can be without disadvantage. The place where the meeting was held will be left dirty and littered, and the area of demonstration needed to be closed off which will cause traffic throughout the day. Even if the cause of the demonstration is for the better, there are certain unpleasant things that will eventually happen, may it be expected or not. So the government issues permits and other paperwork for the organizations to be able to conduct such activities. This is a form of restriction to the movement of the people. I think that the government must execute restrictions to maintain peace and order in the society. If there are no laws to restrict people's actions, there would be chaos because people will want to do whatever they can think of. Certain limitations may be biased to the government but, generally, it is for the good of the people.