Thankfully no Israeli military commander will take any notice of this daft statement if only for the reason that it will harm IDF operations. We all know that war and the military is a cold hearted, ruthless business. However it requires clear minds and cool heads. You can leave merciless actions to the SS. That is why they lost.
Western-backed Syrian rebels say kill foreign Islamic State (Reuters)
from the article: IDF Chief Rabbi: Troops who show mercy to enemy will be 'damned'