Is there something in the human psyche that demands simplistic answers? ("If we can just solve the overpopulation problem, everything will be OK.") Or do we find dark delight in news of impending doom? Or a secret self-loathing, that readily embraces the notion that we ourselves are the biggest problem? I have already discussed what I refer to as this self-loathing "Thanatos" phenomenon, and have suggested a possible antidote as well.
A more sinister explanation to consider is that some people are deliberately beating the overpopulation drum to further their own agenda. One extremely well-researched book that explores this possibility is Dr. Jacqueline Kasun's 1988 (later updated) book, The War Against Population. Read this online book review for more info, or, better yet, get the book and read it yourself. This is not some nutty 'conspiracy theory' work. It is well documented in showing that some very powerful elitists view population control as a key to their political and material interests. To really control people (and their stuff), control their numbers. One well-exposed example is the Nixon Administration's 1974 National Security Council Memorandum 200 (NSSM 200), a.k.a. the "Kissinger Report", and subtitled "Implications of Worldwide Population Growth For U.S. Security and Overseas Interests". Consider just this one citation among many from NSSM 200:
Population control advocates have nearly always been members of rich, industrialized nations. Do they fear the demographic advancement of poor nations? Typically, they are also kindly disposed toward Planned Parenthood (obviously), and antagonistic toward Christianity (especially Catholicism). On a personal note, when I began to recognize that there might be ulterior motives at work, I finally started questioning the scientific neutrality of many population studies. Dr. Kasun's book helped me to sharpen these questions.
In addition to exposing an anti-population agenda, Dr. Kasun presents a formidable quantity of evidence to debunk the myth - and groundless fear - that we humans are too many in number, or anywhere near too many. Do you find this important? If so, you may want to read her book, or get more general information from The Population Research Institute.