There's no other way to say it. When a Jihadist imams calls for Israeli soldiers to be exterminated mercilessly in their beds, we say 'ah that is the unnaceptable face of Islam.' This man is no better. He is a stain on Judasim. The danger is that his doctrine of murdering first, rather than arresting and interrogating and trying may already be a growing cancer within the IDF. Any responsible government would ppublicly condemn the former Chief Rabbi and possibly charge him with incitement. Obviously, from Bibi;s government we're more likely to hear agreement and encouragement.
Palestinians report IDF airstrikes on Islamic Jihad targets in southern Gaza Strip (Haaretz)