You misunderstand. My preoccupation is not with any enemy that comes after the Scarrans. After they are defeated, I will cease caring about the rest of the galaxy. Let it take care of itself.

Or, to use your progression of thought, why should I hold off destroying a very real, prominent threat in the idea that a hypothetical one exists?

Or what makes you think that once the threat is destroyed, I will not simply destroy the weapon used to end them?

There are a thousand futures. But there is only one current reality.