the question of having babies - which is natural - is handled tastefully... and I think anyone understanding a game that starts with few adults can accept the limitations that puts on the parameters. That is very different to players being able to take deliberate decisions to kill any amount of villagers they choose.
Also, VV1 villages thrived very successfully, thank you, without the option of murdering ones villagers -- and for that matter, many of us managed to nurture successful tribes in VV2 without killing people who have a hard enough time scratching out a living.
And since when is killling a villager who happens to be a little slow at learning, been a critical factor in having a successful village.