People Power? What's the essence of it?

I don't really get why people go to the streets and complain about some politicians who are corrupt. They get hurt and sometimes (often) cause troubles on other people. They cause heavy traffic. They just bring noise and garbages. They say that they're just fighting for what is right. They are fighting for all the people of the nation.

Then suddenly when that politician, (who are kick out from the position) apply for another position in the government, they still vote it. I don't really get the essence of people power if they still chose that politician to become one of their leaders. Do they forgot what that politician did? Or that people power is just a waste of time? A country scandal where a lot of idiots gather together and screwed the day?

Or they just want to put in the headlines, "Idiots, screwed some politicians"? Do it makes our country an idiot friendly country? What you think?

Photo Credit: Google