i don't see the problem in the foster system itself (yes the system may have issues, but that's another topic)
the problem is that fostering in most cases is the wrong way to help those children. instead the parents need help. but that help needs to be provided in a way such that parents and children can stay together.
but that is not what is done. instead the children are taken away and the parents are left to themselves: go fix your problems, and then you can have your children back.
pretty much the only cases where fostering is the right choice is where children are in actual danger or the parents need to go to prison for serious crimes.
the problem is that fostering in most cases is the wrong way to help those children. instead the parents need help. but that help needs to be provided in a way such that parents and children can stay together.
but that is not what is done. instead the children are taken away and the parents are left to themselves: go fix your problems, and then you can have your children back.
pretty much the only cases where fostering is the right choice is where children are in actual danger or the parents need to go to prison for serious crimes.