... we are probably in the Worst Possible Timeline and never venture beyond our solar system let alone our planetary system.
The Vulcans are sitting just outside our solar system and see what's happening and are saying to themselves 'yeah, we'll pass, these guys are doomed anyway'
You win the Back to Reality award. Congratulations, I guess.
A variant would be that we're on the Third Body Problem alternate timeline, where everyone in the Dark Forest already knows about us and don't do anything simply because we are our own worst enemy and will take care of ourselves.