You're describing instinct, not logic or nobility. You instinctually feel that the human race surviving is a good thing. This does not set you apart in any way, shape, or form, from those who feel that their existence explains its own value. Your choice remains arbitrary, and the justification you've offered above is blatantly circular
Instinct is reality. Morality, on the other hand, is invented and reinvented by every generation. There's nothing 'arbitrary' about reference to manifest reality.
Will and desire are likewise inherent to being, and thus of inherent value. Morality is not.