It is easy for a rabbi to establish prohibitions, but a rabbi's real strength is to teach Torah and rule on lawwith an emphasis on what is permitted.
Ovadia YosefIt is forbidden to be merciful to them. You must send missiles to them and annihilate them. They are evil and damnable... The Lord shall return the Arabs' deeds on their own heads, waste their seed and exterminate them, devastate them and vanish them from this world.
Ovadia Yosef