They bang on about universal sovereignty being the biggest issue in the world because the vindication of Jehovah's name is supposedly paramount.
I think this is a dead giveaway to what's going on in the mind of JWs, they desperately want vindication. Vindication in the eyes of their neighbours, colleagues, nonJW family, all the 'worldly' people they know.
It's hard standing out as a weirdo with crazy beliefs. They want their whole life to be vindicated, even if it's only a few minutes before the unbelievers get nuked by their loving creator.