changing nationality to play international football

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is it right to change 1s nationality in order to play professional football?shouldnt 1 be proud to play for his nation....?and if he finds it hard to get into the national side shouldnt he word harder and keep tryin instead of tain the easy way out and changing his nationalit? some examples are....deco(brazillian but now portugese),viera(senegalese now french),zizou(though his prents came to france when he was very young so that is understandable)... one who almost did it cuz he couldnt get into his international team is edu(ex arsenal player).he is a brazillian and was thinkin of changin his nationality to english brefore they gave him a place in the brazillian team.... i think doing this is totally wrong and that people should play 4 their own nations....like dwight yorke who could have gotten into english team very easily during man u's golden era!!!!but he chose to play 4 his nation...T&T!!!!i respect such players!!!!they r bringig up football in their nations by perfoming in such a way!!!