The meaning of the graffiti in Colombia, Honduras, Brazil and Argentina

I've watched and read about the meaning of the graffiti among these countries and I realized they have something in common. Those people use the graffiti as a way to express the feelings they get from different aspects of the society, especially politics. The graffiti is generally used as a way to express violence and all the bad things the society has had to live daily. It is also used to express their talents and culture. These countries use the graffiti with the same intention northern african countries do; to show the way they feel about having a corrupted government on the lead.  

We can learn something really big an important about this: we all are the same; we all are the same rights; we all deserve a better and grateful life.  So,  graffitis are a wake up call  for the government who has to do something now to maintain the balance of the society.