I could understand it if someone in the leadership had said he was inspired or that he'd had a dream or a vision -- something -- but the WTBTS has all of the hallmarks of being a manmade organization all the time it's billing itself as a divinely chosen and established institution. Further, it sees itself as being the Kingdom of God as foretold in Daniel 2. But that kingdom was said to roll forth “without hands” and would “not be left to other men.” Yet everything about the JWs points to being just the opposite.
The general membership calls it “the truth” and though others say they're “arrogant,” it's a bit more than that. It's more “smug.” They see themselves as having the inside track and they're told not to waste their time on on those who aren't interested in conversion. In fact, if you show resistance, they be downright disagreeable. Many of the Witnesses I've met are nice enough, but the more zealous ones are those that tend to be difficult. And those, I suppose, also are deemed the most righteous. And because they assume they're going to fare better in the afterlife, they also believe they know things not known by members of other faiths. And it's this, I think, that makes them smug. 😏