How about this: The nation of Israel had been given their orders. They ignored them, and were punished when they ignored them. God did not change his rules or directions. God stayed the same. It was the Israelites whose flame faltered before God. In the case of the WT, they claim to be guided by God, but then claim that God is giving them conflicting information/understanding than what was given previously. The WT people-JWs keep doing what the WT tells them to do-faithfully following the organization in everything until the organization tells them that Jehovah's requirements have changed or been refined. The JWs as a whole are very faithful to WT teachings, although sometimes it is hard to keep up with the current teaching, god knows!
So, while God did not abandon Israel for their sin=as a nation, he often punished the sinners directly. Also, those people knew that what they were doing was going against God. JW's are not following God, they are allowing a group of men proven to be faulty lead them into destruction. And those men KNOW they are doing what they think is right, not being led by the spirit. They are making politic decisions, financial decisions, legal decisions and couching them in a way to mislead those who are willing to be lied to. And then they claim -all of them, that GOD is the author of all this confusion. THAT is a pretty big difference if you ask me. Which you did! :)