How are you defining effectiveness? Many campaigns for justice take years if not decades, and can produce numerous protests during that time. Those protests are

How are you defining effectiveness? Many campaigns for justice take years if not decades, and can produce numerous protests during that time. Those protests are only 'ineffective' if you imagine that conducting a single protest march or camp might change the established order overnight. That is not the point of protests, which are instead designed to register contesting views with those in power, and promote those views to other potential supporters. In that way many protests are, in fact, highly effective, and non-violent to boot. The view point which you are espousing, whether you believe it or not, is a time-worn tactic of disinterested or opposed parties who aim to curtail freedom of expression by claiming offences to public order. There are plenty of laws for dealing with violence against people and property, but also laws protecting people who are engaging in free speech, and the fact that someone happens to be promoting social change shouldn't be taken as an excuse to ignore the latter, or misapply the former.