There are gangs and violence in this world. You fix one another takes its place. It is an ongoing battle for police. Sometimes mistake happens. We are all just human.
As for the case you presented. It was resolved. The officer was removed from his position. Protester made their point. They showed that unity is power.
Ferguson police chief apologizes over black teen's shooting - Yahoo News
I never said Democracy is God, but it is the only system present that helps protect the people in such within the rules of law and limits the power of government officials. Changes takes time. I am not trying to advocate democracy. I am just defending it. Government officials are not born with the abilities to read our minds. How would they know what we need without asking us or by us telling them? Changes don't happen immediately with protest. It take months or years. There is a process that takes place.
Please read factor effecting democracy in India in the link provided below. I am not that good with India's politics.
Democracy in India - Wikipedia, the free encyclopedia
I think I will stop here. I don't want us to argue over this. Please feel free to ask me anything you like.
Thank you for taking your time out to reply.
Best Regards.