I am very late to this party, but I just saw the video of Joss Whedon accepting his Equality Now award in 2006 (I wrote my thesis on Buffy and other modern feminism/postfeminist topics post-Girl Power in 2005). And this. This. This. This is my answer to why we need feminism.
So… why do you write these strong women characters?
Because equality is not a concept. It’s not something we should be striving for. It’s a necessity. Equality is like gravity. We need it to stand on this earth as men and women. And the misogyny that is in every culture is not a true part of the human condition. It is life out of balance, and that imbalance is sucking something out of the soul of every man and woman who is confronted with it.
We need equality. Kinda now.