If colonialism is good for Puerto Rico, why are the results so devastating for her?

http://newamericamedia.org/2012/01/puerto-rican-migration-continues-at-record-pace.php

Click on the above link to read about the record breaking numbers in which Puerto Ricans are leaving our island. 

The article talks about how much less money from the United States government this migration represents.  It does not, however, mention the loss money that Puerto Rico is prevented of generating on her own if Puerto Rico were govern for the benefit of the residents of Puerto Rico.  The fact that Puerto Rico has been a colony of the United States for 115 years is never mentioned here.  For the first time in history, more Puerto Rican are outside of Puerto Rico than on our beautiful island!  If colonialism is great for Puerto Rico, why are the results of it so devastation for Puerto Rico?

Join in 2 peaceful protests a year until Puerto Rico is decolonized.  Obviously, the United States government has no interest in changing a condition that she unilaterally established on July 25th, 1898, and has greatly benefitted for 115 years.  And of course, it should also be even more obvious that those who practice colonialism don't believe in justice for all!