this is one of those cross-roads things ... yes, parental responsibility etc etc, but the observation is having a bunch of poorly nourished kids running around destroys education (for the neglected and for those with responsible parents).
So one gets an alignment of interests, welfare interests for those individuals, and the broad observation that running schools full of hungry kids is in some ways a waste of time.
Food, in this sense, is like books. Folks seem largely o.k. with buying books for children to learn from, food is just a book-tax. Everything just works better for everybody when one jams some food in these kids mouths.
I happen to be related to a teacher who, yup, sneaks food to a couple kids. It is much more productive for all involved than a new batch of pencils.