People protesting on the streets is usefull?
People protesting on the streets could be useful at times but I think that is not the right way to protest and communicate the message.
There could be numerous reasons for a protest and if we take a proper channel or the right path to protest then I think this method of protesting will be more favorable then protesting on the streets.
Some of the ethical ways of protesting is following the right escalation path. So if it's tied to a government matter then the protest should first start with a complaint in the local government official house. Give some time for the authorities to investigate and in the meantime, you could do follow-ups just to check the status of the complaint.
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If you do not get an answer or is not satisfied you can further escalate the issue and in some countries, people approach the Courts. So file an official lawsuit against the party you are protesting with. When the matter is the court it becomes far more official and the parties quarreling will need to fulfill all the formalities and proof that they are innocent and the final decision will be of the Judge to decide upon and resolve conflicts.
Hence, following the right path of the escalations is the right way to protest. Protesting in the streets I think will create much chaos and delay in getting the protest resolved.