The major problem underlying all others is undeniably conservatism in all its forms, oligarchical, religious, military, political, economic, educational, sexual, racial, gender and social conservatism.
Based on fear and violent reaction as in all lower species, (https://www.psychologytoday.com/blog/the-human-beast/201104/conservatives-big-fear-brain-study-finds)
conservatism brings about the conflict necessary to depopulate a humanity exceeding 7.3 billion people, while refusing and even prohibiting the use of planned parenthood for that purpose.
NWO oligarchy conservative's brutish, vicious, subhuman, savage, cruel, barbaric and bestial or animal-like behavior is meant to balance the population and resource availability of our species by killing off the "unproductive".
They leave population/resource control up to their "free market" monopolies (?) or may simply not have evolved enough to want to keep our populations in check using birth control without the violence and suffering. Their long refusal however, will mean that birth control will take a long time to achieve a population/resource balance while war, crime, starvation, disease, global warming, etc. are much faster.
Also, violence has the advantage of killing off men, women and children so that a few children are not saddled with the care of an aging overpopulation as is happening in China with their one-child policy.