I agree that it is mostly greed. The problem I've always had with the various conspiracy theories is they all require a level of institutional competence that I have never seen in any context whatsoever.
The sub-prime mortgage thing and the resultant general financial crash disabused me of any belief in institutional competence. That, and our numerous botched foreign interventions, the failure of NASA to enable large scale human settlement of space (O'Neill L5 scenario), the failure of the ITER tokamak fusion program to develop commercial fusion power, and that 95% of all biomedical research is bogus. All of these things over the past 30 years has convinced me that institutional competence does not exist.
There are elements of our so-called elites that would like to do some of things that make up the conspiracy theories (Bill Gates wanting to depopulate the third-world, for example). But wanting something and the actual ability to implement such are two completely different things.
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Its all in the mitochondria.
Its the future and...you're not.