Some parents abuse their kids.
Child welfare workers are supposed to stop that to protect the kids.
But bad things often happen while they watch. 'Children have a right to safety,' says Tim Keller. 'If home is a danger, we as a society have to step in and protect those children.'
Keller, legal director of the Center for the Rights of Abused Children, is a libertarian.
'It's surprising to hear a libert…