No, my flaw, such as there might be, is in not making it clear that I was interested in the scientific basis for ID, not the religious basis.
OK, but that's not what you asked. You spoke of how "cruel" birth defects are, and wanted to know how they could be reconciled to ID. Since ID makes no claims that organisms are perfect, nor any claims about the benevolence or malice of the designer, there is nothing to "reconcile."