Evolution has no desire to make sense, it's a blind natural process with no intent or point of view. From a human point of view, what he said makes perfect sense.
Even in startup culture, it makes sense that some business (existing lives) have to die in order for new business models (those yet to be born) to emerge.
What's to say that the existing lives won't hinder growth that would happen from new lives being born and re-imagining the world that everyone is used to?
You committed the naturalistic fallacy. Also, inevitability isn't a justification for bad things happening.
There are also practical considerations: if death is eliminated, we must stop reproduction too.
I would prioritize existing lives over the yet to be born.