That reaction is in fact counterproductive, such that it increases the overpopulation problem. Support for, or opposition to, population control, is the result of the genes. The only way to stop overpopulation is for population control supporters to make more offspring, so as to ultimately gain the upper hand that is necessary to implement population control. Voluntary birth control does not constitute population control, by the way. The majority of heavy-breeders are breeding for the sake of breeding, meaning that distributing artificial contraceptives such as condoms will only stop some of the breeders. The only true population control is the forced sterilization of the heavy-breeding population control opponents.
In addition to the number of children that a person makes, the age of reproduction is also important. The heavy-breeding population control opponents not only make more offspring, they also reproduce at a younger age, which accelerates their rate of population growth and reduces the genetic damage to their offspring. The population control supporters must not only produce more offspring, they must breed at a young age. 35 years of age is a good cut-off point to use for keeping genetic damage to the offspring reasonably low. I personally have done my duty to the planet by making a surplus of children with a like-minded woman, at a young age.
Next is the description of how the genes and character traits relate to support for or opposition to population control.
Opposition to population control is related to 2 other traits: theocratic ideology, and cheerfulness, which are related to eachother. Cheerfulness is the intent to ignore, perpetuate, and exacerbate problems. Theocratic ideology is the intent to cause problems by placing inefficient symbolic burdens onto everyone, such as the symbolic preservation of life regardless of the quality of said life. Opposition to population control is such a desire to cause and perpetuate problems.
It is the theocrats that are making the most offspring, and deliberately so. The theocrats are both the strongest opponents to population control, and the people that deliberately make the most offspring.
There is even a group of theocrats called 'quiverfulls' (the name derives from a psalm in the abrahamic bible, which compares offspring to arrows in a quiver), who are deliberately making as many offspring as they can, so as to take over the United States and impose a theocratic ideology.
Ironicly, by making many offspring, and at a young age, the theocrats are behaving as if they are atheist genetic determinists, which are the most extreme type of atheist, in contrast to their own supposed belief in free will, divine determinism, and/or contagious holy spirit. Every time that a theocrat spits out a child, it is a tacit admission that the atheists are right. Only through doublethink are the theocrats capable of believing in a god and the related theocratic dogma, while simultaneously seeing the truth of atheist genetic determinism on some level, and only by being extremely self-blinding (i.e. wrongful), are they capable of such doublethink.
Population growth is highest in africa, south asia, and latin america. Those regions are known to be the poorest regions, but what is less well known is that they are also the most theocratic regions, contrasting with the regions of anglo-america, europe, and north asia. In the aforementioned theocratic regions, and in the world in general, it is the theocratic individuals, among christians, muslims, and jews alike, that are making the most offspring. All of the theocratic regions, in contrast to the non-theocratic regions, have abortion outlawed (except of course when the mother's life is threatened, which is the only exception that most anti-abortionists make).
Outlawing abortion itself is not the largest cause of overpopulation in those areas. Although it does increase overpopulation somewhat, the overpopulation in the theocratic areas is mostly the result of the fact that the anti-abortionist theocrats (who constitute the majority in the theocratic countries) are the same people that deliberately make many offspring.
There is a line of latitude, 36 north, south of which almost all countries are theocratic, and north of which almost all countries are secular. Most of the inhabitable polar land ('polar' being a relative term here, referring to anything more than 36 degrees of latitude away from the equator) is in the north; the only inhabitable places that are south of 36 south latitude are the southern halves of Argentina and Chile, most of New Zealand, and the southern extremity of Australia, places that are largely populated by europeans. The only european country that has excessive population growth is also the only country in which abortion is outlawed; it is Ireland. The climate of Ireland is similar to that of the equatorial region though, because it is an island surrounded by temperature-moderating water, such that it's summer and winter temperatures are similar, as is the case in the equatorial region. Spain, which is also a coastal country, and one that is not far north of 36 north latitude, has a theocratic leaning, and during much of the 2nd millenium CE it was the most theocratic country in europe, followed by Italy, another southern coastal country. Spain and Italy were also 2 of the 3 fascist european countries, fascism being similar to theocracy.
The popularity of theocracy and deliberate heavy breeding in the equatorial region, and the dearth thereof in the polar region, clearly indicates an evolutionary psychological effect. As mentioned previously, it is the low temperature difference between summer and winter that characterizes the equatorial regions, as well as some polar coastal areas. Such a climate is easy to live in, and therefore has weak selective pressure. In order for a subspecies to maintain it's genetic quality in a region that has weak selective pressure, the subspecies must place artificial burdens upon itself, called handicaps. That principle of evolution is called 'the handicap principle'. It is from the handicap principle that theocratic ideology and cheerfulness derive.