The Wormhole wrote:
Yeah, I've often had this problem with these villain bent on destroying everything stories. Once everything is destroyed, what's left for them to do?
Villains like Davros and others who have these types of plans are insane. They don't have any rational idea of what they'd actually do if they reach their goal, they're just obsessed with achieving their goal.
But I agree with the people above who say they'd eventually turn on each other. If Hitler had actually wiped out all other races to create his "master race" at some point he'd start seeing "flaws" in certain Aryans and start trying to wipe them out too.
There's no rational endgame for crazy people.