That really is someone else's problem. The best the school can do is feed and support the child and report the abuse to the relevant authorities.

You know, we say “don’t let perfection be the enemy of the good” a lot for technical problems but it’s far more critical here. A child from a failing home has a lot of problems and it often takes a long time to solve them, but we can for a trivial amount of money ensure that child isn’t malnourished because they get breakfast, lunch, and in many Title 1 schools, dinner. Many of the other problems of poverty, neglect, or abuse are much harder to solve – e.g. sending a child to foster care might be the solution for abuse but it’s slow and has plenty of risks of its own – but this one is easy and cheap to fix while we work on the hard problems.

Of course that is not all, how on earth did you get that impression?

Doing something to address a problem doesn't imply that nothing else will be done and that this one thing is expected to solve the problem entirely. I didn't think this needed explaining.