Self-preservation.
The WTS has been using the "death at Armageddon" card since its inception.
Think about it. What's more important to a human being than preserving their own life?
Sprinkle some biblical truths on top of that and you have blind acceptance to do with the person as you wish.
Not too long ago I overheard an elder tell a teen in our hall that he wouldn't see high school. The teen made the mistake of telling the elder he wanted to be an engineer. The first chance I got I pulled that kid aside and told him that no one knows when the end will come and that choosing to attend a university is his and his decision alone. The kid agreed and later on I heard his parents did too.