This statement seems to be based on a false premise that foster care is bad care (it is often very good care where I originate from, UK) and ignores the fact that sometimes parents kill their children and that there are many children in desperate need of help.
The greater problem with the CPS or similar agencies is underfunding. This leads to families only having dealings with them when the circumstances are suspected of being dire, rather than CPS having the resources to support parents in a meaningful way over a meaningful period of time. Such meaningful support helps to reduce the need for more drastic interventions and allows social workers to have much more knowledge of the families they are helping and of when interventions are needed.
it's not the foster care that is the problem. even if the foster parents are perfect, separating children from their parents against their will is causing severe trauma to the children and often hurting them more than what the parents might do to them.
i agree with your second paragraph. the focus needs to be on supporting parents to take better care of their children.
The greater problem with the CPS or similar agencies is underfunding. This leads to families only having dealings with them when the circumstances are suspected of being dire, rather than CPS having the resources to support parents in a meaningful way over a meaningful period of time. Such meaningful support helps to reduce the need for more drastic interventions and allows social workers to have much more knowledge of the families they are helping and of when interventions are needed.