The Israel was first argument will only be used when suits their needs, because when it comes to who had the land first, and who later in history developed to a modern country first, and who needed to defend it first they wont seem to think that is important. Playing fair only works when the other side respects the rules, otherwise Israel should tell them to go pound sand.
Funny, I never heard of any Israeli leadership calling for the destruction/eradication of an Islamic state.
We have heard such barbarism time and time again from the Arabs and most recently out of Iran.
Israel had very good reason to rain atomic destruction on its neighboring enemies in the past and resisted. Their track record is more convincing than anything these Islamists can present or promise.