Left-wing sympathizers (including the original movement) are already manipulating the protests. A portion of the people in the protests diverged and tried to break into the state hall (where the governor sleeps). Why, if the bus fares are controlled by the city mayor? They should be protesting on the city hall, but they won't, for obvious political implications since the mayor is left-wing.
Right-wing are also joining the protests now in an attempt to overthrow. The anti-corruption sentiment of the general population can be fuel to an impeachment of left-wings in power in the following days.
The media at large is also reporting the happenings in a positive light only. We all know this can't be good, a functional media is one that shows two sides of the story, but it seems most media outlets are too scared to disagree.
Finally, the moral judgment already started on the social networks. Anyone who doesn't join the protests gets alienated. Since social networks amplify positive feedback only, things are turning into an echo chamber.
Different than other brazilians, I'm not 100% happy the "people are waking up", I'm actually scared because it's just a bunch of fed up people hitting the streets without a clear objective.
This has the potential to be really good if the people put political parties aside and keep putting pressure on important matters in the following days; but can also be catastrophically bad if radical leaderships pop up from this.