because she ignored her children for her causes. She'd keep my sister out (at 6 years old) until midnight because she was at meetings. We'd have random homeless people sleeping on our living room floor because they were kicked out of shelters for rules infractions. We'd have strangers joining us at Thanksgiving because they had no place to go and if she actually thought to ask our permission and we said no, we'd be the bad guys.
Raising your child to be aware of politics and talk about politics is one thing and be politically active is one thing. Actually neglecting your child (and I say "child" because I didn't move in with her until I was 17, I really mean my sister) because your causes are more important than your child is a totally different story.