what sense is there in the life of a handicapped person?

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if we judge the value of a likfe according to criteria of efficiency, productivity and economy, society would tend to do away with those handicapped persons who are not useful and who cost a lot because they require so much care. so , why shold the handicapped live? what sense is ther in their life? it sounds they are useless and extra for the world. is that true? it makes me so sad when i heard about the statement, how about u all?