Gender bias in video game dialogue

I couldn't help notice most of the games examined focus on piracy (Monkey Island), various military acts (Mass Effect, Final Fantasy, Elder Scrolls..), or exploration (most games to some degree)[1].

Before we accuse games of bias, shouldn't we compare with the proportion of real-life pirates, soldiers, or explorers, that were women?

[1] The King's Quest series doesn't fit neatly into these categories, but is distinguished by having been designed and written by Roberta Williams, a woman. Regardless, I'm sure the authors of this article wouldn't dispute that women had a marginalized role in the middle ages, where King's Quest takes place.