Imagine a JW. I true believer. On the scale of belief and fervor, this JW is set at maximum. He lives at the KH, practically. Always out in service, and ties each and every conversation topic back to Jehovah and the WT.
Now, remove from this imaginary JW the moral belief that he should not kill. Also remove from him the belief that God will judge the world later at Armageddon, and add the belief that there is an imperative command from God himself to be the real instrument of His justice right now, so that "the entire world is for Jah".
Now remove from this JW the belief that he should not remain neutral in politics, and add the belief that the WT org is the only real and valid source of political authority, and only it should rule.
Now multiply this JW by a billion or so, replace WT with "Islam" and give them guns, rockets, tanks.
Welcome to the middle east.
Would you like this version of the GB to get a nuke too? Is there any doubt, if thats what drives them, they wouldn't use it?