Comment by zarzavat

Yes, but for most of human history we didn't have contraception either. People had children because it was either that or abstinence, and abstinence sucks. Not to mention the need to create heirs who could look after you when you became too old to work.

In an advanced society where the threat is depopulation rather than invasion, xenophobia is harmful unless you can find a way to convince people to have more children than is rational for them to have.