My understanding of God & his son Jesus Christ is that they are still fighting a war with Satan that is showing all of creation (on a universal scale) what happens when we allow Satan's plan to take root in any world our Father created (if he created Earth, wouldn't he be powerful enough to create others?) Satan's plan was simply put, to force others to do what was right & save every single soul because they had no choice. Jesus Christ advocated for individual accountability & for the choice to follow our Father's path of freedom to choose & personal responsibility for our choices.

That said, the end result always needed to be that you must show all of Heaven that IF we allow Satan's plan to play out, that it will be a horribly destructive decision. Satan could content that IF God had only allowed a little more time, it his plan would have course corrected. As Q says, you must show them. So too must our Heavenly Father show ALL souls what happens if we allow deception & use of force through fear to compel behaviors vs natural consequences with choices through love. Besides, even if every single individual on this planet did die off (which will not happen) our Father can resurrect any of them that Jesus chooses to have resurrected & saved due to his perfect sacrifice.

I might be wrong on my whole religious take, though my experience in life has taught me that it seems pretty spot on thus far & to remain humble enough to listen & learn if I am wrong about it.