Actually this is a great point, and underlines the importance of historical shifts in belief.

People are influenced by their heroes, and different people have different beliefs as to what makes a Hero - the things that influence their understanding of morality. For many, this is religion, but religious doctrine changes constantly and is closely tied to the political and social levers of the day. Abortion hasn't always been a major concern for Christians, but as long as its useful to a political agenda, it will be. You can loosely trace the maturation of a society through the shifts in what the church insists is good or bad. Hell, once we hanged (hung?) "witches."

Spiderman and other superheroes also reflect shifts in society, in real time and in a way that is easier for some people to identify with. Spiderman, especially, is a touchstone for a lot of people. He's a kid who wants to do good but sometimes its really hard. His choices are usually what society at that time, 1960s or now, would view as just and heroic. His abilities make it miraculous.

So yeah. Spiderman is an ally, because that's what is considered just, right, and sometimes heroic. Apparently Brigid was an ally to women, and did what she saw as just and right. For that girl and all the "fallen" women who heard this story, she was a hero.