You need to know this.

When demonstrators become a mob, they will be contained. Whether it is by local law enforcement, state militia, or marines. A mob can never be allowed to rule. Unfortunately, when authorities crack down on a mob  many innocent people get hurt. Tear gas does not know bad from good. Neither do rubber bullets. 
     I really cannot understand why more people don’t form crime watch patrols for their neighborhoods. Most law enforcement agencies will gladly help you set one up. 
     I know from about 30 years of crime watch experience that the cops rather work with you than against you. If people feel too alienated to work with law enforcement for the betterment of their neighborhoods and protection of the residents thereof, then it is time for local leaders to address the cause of this alienation.