Explaining the Inexplicable
Source: rabbihorowitz.com
There is a timeless Yiddish saying - "Vos es feilt in hasbarah, feilt in havanah" - that is probably most appropriate in analyzing your dilemma in responding to your child's questions regarding this horrible tragedy. Loosely translated, it expresses the stark truth that when we find it difficult to explain concepts to others (hasbarah means to explain, while havanah denotes understanding) it is often because we ourselves don't understand them fully.