It does perhaps say that, but it also perhaps says that the parents and administration of that school are less concerned about the inevitable (or possible, if you prefer) negative influence they will have on the other children.
It also says the adminstration is not willing to write off their fellow jews unlike the Charedi schools who will refuse to let them in. They are willing to take the risk that they might be a bad influence in the hope (and they are more successful than you think) that a good influence will occur on them