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Social exclusion, or social marginalization, is the social disadvantage and relegation to the fringe of society. It is a term used widely in Europe and was first used in France. It is used across disciplines including education, sociology, psychology, politics and economics.
In other words: It's not your ethnicity that means you are more likely to become a gang member. It's whether you are marginalized, alienated or rejected. All of this has been taken into consideration, and is considered an effect of social exclusion. Be accounted for means taken into consideration in this context. See the last usage given in this definition. So the sentence refers to taking into consideration the factors mentioned before. Specifically, this (which is difficult in such a long-winded sentence) is referring to the fact of being marginalized (...) makes some groups more vulnerable to gang formation.