But if a situation occurred where further breeding became a direct threat to others (limited resources, etc)

Impossible to happen. It is always an indirect threat. Claiming that it is a direct threat is more of a threat to society.

proven themselves to be someone that will harm any child produced and left in their care, it is up to the group to remove existing child from the individuals custody, and ensure that the individual does not create any more innocents to harm.

It's not within the rights of the group to do that preemptively.