Decide which is the less-worse situation for the child: being in a foster home or being in their family home.
I don't know who is making the argument that children should be taken away for failure to be vaccinated. But you can use sticks like forbidding them from enrolling in public school and sending CPS workers for unannounced home visits.
Snowstalker, Harry, and Lurker off the top of my head. There were some others who referred to it as child abuse, which presumably means they would support removal from the home. Actually I got the impression that you held that position from the sick privilege thread, but I see that's not the case.
