What's the correct way to allocate resources to insure against existential tail risk?

technical founder/builder of a seed stage AI B2B startup @ycombinator. FID #573

A future threat that can wipe out the existence of X (X = thing that you're insuring).

e.g. 
AGI -> humans
Imminent Asteroid -> humans
'08 financial crisis -> your investment portflio

Continuing the animal analogy a bit - humans goals have directly or indirectly led to the existence of many animal species. There is a world where a being with a step function increment in intelligence relative to us has its own goals that directly/indirectly similarly affects some/many/all humans.

Why AGI would wipe out humans? When humans evolved from Neanderthal, we didn’t wipe out other animals. And in the long run maybe they will survive after humans will go extinct.