“Either she is a colossal idiot or the goal to explicitly destroy America is no longer being hidden.”
You don’t have to pick just one. It CAN be both.
For the democrats, putting forth imbeciles as their candidates is a feature, not a bug. They understand and favor the idea that the US is no a technocratic oligarchy ruled by the bureaucracy. They don't want some egomaniac politician getting ideas into their head and mucking things up by taking independent action, even if they are nominally on the same side. Thus the rise of the empty-suit figurehead political class.