Is graffitti a cry for attention?

It can mean a lot of things .. defiance, opposition, alternative truth expressions .. I once took a unique tour in Berlin to study the underground art and such .. it's fun when you know what you are looking at .. apparently it's not lame most of the times and means something.. especially to the artist. The general public, being the general public .. remains illiterate and oblivious to the meaning .. ignorant of the fact that something of meaning or value to another human being was created in his/her vicinity .. it remains unappreciated..