And while I agree with you that evolution is powerful, reliable birth control is recent enough that we haven't adapted to it. It's quite possible to control when you have kids via abstinence, birth control, and abortion. But it does require long-term thinking and contentiousness, and my point is that these sob stories are mostly missing these personality traits.
Taken to its logical conclusion, I see no reason why that would not lead to a society where murdering kids up to a certain age is the expected norm when the family falls on hard times. If there is a god, I would hope he/she/it would go all Sodom and Gomorrah on it.
When we make public policies, we need to start from a baseline assumption that human sexuality exists and sometimes babies happen and those policies need to respect the privacy of the couple whose coupling created that child and their right to make a hard and complicated decision balancing multiple different interests. Sweeping policies of "just don't have kids" go horrendous places, including forced abortions of late stage pregnancies which are essentially murder because the baby is developed enough it would be viable outside the womb if the mother went into labor.
You may call that sexual morality, I call it common sense.
Quite the opposite. I'm interested in people changing their decisions in such ways that children have better lives. Simultaneously, I'm am very much against my tax bill and my city's crime rate being higher because of completely avoidable problems.
Most children aren't actually planned. They occur because mother nature has spent millions of years perfecting the art of tricking people into liking sex.
Or, as I sometimes say, our genes are like virii: They don't care how miserable they make you in their quest to reproduce themselves. Coincidentally, genes and viruses are both made of RNA at their root (DNA being two RNA, basically).