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It's abuse of statistics to fabricate a nonexistent problem. People do it because it works so well and is so easy. Everybody wants to help women and "marginalized groups". So with some superficial, misleading statistics, you can attract attention, money and hiring advantages. Why wouldn't people do it? (I mean campaigning for those parity goals. Why companies chose to try to comply is probably simply PR, and the hope to be able to hire cheaper developers).