Social conditioning via media manipulation and slow poisoning of the general populace with vaccine adjuvants, pesticides, pharmaceuticals, hormone mimickers, GMOs, air pollution, overuse of medical interventions, brainwave disruption via screen technology, 5G, moral degeneracy, fluoridation, the depletion of essential nutrients from the foods and consequently the diet, promotion of toxic emotional/mental environments that encourage substance abuse, amalgam fillings, and the list goes on and on. But if i had to pick one thing, its the idea that Truth is subjective which in itself is a logical fallacy. However if you can convince people of this lapse in logic, you can get them to believe anything that sounds vaguely right or nice.