You mean you're looking for arguments against such a quota?
I can see 2:
- some people might say that it's too little, and it symbolically shows that women don't have any much power than men
- other people who don't want a quota at all would say that a quota would lead to people getting into the parliament without a qualifiction, just because there needed to be enough of such and such people: it's better to just let people decide
