There were many other reasons listed, including low immigration, small families, contraception/abortion, abstinence and pollution. This checks do apply do the

There were many other reasons listed, including low immigration, small families, contraception/abortion, abstinence and pollution. This checks do apply do the countries you cited, but the list is still far from comprehensive. They are far better than war, famine and disease, but still regarded as bad things, which is the point.