Militant feminists are pro-choice because it's their ultimate avenue of power over men. And believe me to them it is a question of power. It is their attempt to impose their will on the rest of society particularly on men.
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The race of mankind would perish did they cease to aid each other. We cannot exist without mutual help. All therefore that need aid have a right to ask it from their fellow-men and no one who has the power of granting can refuse it without guilt.