At some point it gets bad enough that you look for other ways to help children...
If that doesn't apply to you, there's still plenty of things you can do to help out; I ended up on that list from being a foster parent, but I'm sure if you contact whomever is in charge of foster care in your area you can get on the list. Usually whatever local version of child-welfare/social services you have will know what the needs are. Where I am, providing transportation is always a need (e.g. kids to school when they've been moved too far for a bus; kids to and from visits with birth families, &c.)