There'd be a lot fewer people, otherwise. From a pragmatic point of view, we've likely evolved to answer yes to that question, otherwise we would've been outcompeted by another species with a thirst to live and reproduce.

Not necessarily, there are a lot of species that are functional no-ops, such as the Luna moths that grow up to be unable to eat anything as they have no mouths. They can only procreate, continuing the cycle. They are no-ops because there is nothing they can do besides procreate, they cannot even obtain sustenance. So, they might say that it was not worth being born, had they been able to be polled.

The survival instinct is still active if someone would rather not have been born, as is the instinct and desire to reproduce.