Why should we stick around?
Sorry Buck, but I'm quickly losing faith in humanity.
What's happening in Iran, Gaza, Ukraine, Lebanon and in our streets shows our basic nature. For a civilization to survive long enough to develop the tech to become truly "space faring", it would have to become peaceful to the point of being altruistic. (Counter to that, it's ironic that war is the main driver of technology.)
Yeah, we're not that. If we manage to ruin the planet and bring on our own destruction, we don't deserve to continue.