I think it's a question of professional autonomy. In your neck of the woods, Louise Carbert did a very interesting analysis of women in Atlantic Canada. She found that because of the overrepresentation of women in the public service, a lot of them felt that even if they had the right to run, they were compromising their professional trajectories or the trajectories of their partners, their husbands; and they really couldn't. They just felt there was too much risk attached to being breadwinners, or what have you.
On June 7th, 2018. See this statement in context.