Wikipedia:
Dunning–Kruger effect
In the field of psychology, the Dunning–Kruger effect is a cognitive bias, wherein persons of low ability suffer from illusory superiority when they mistakenly assess their cognitive ability as greater than it is. The cognitive bias of illusory superiority derives from the metacognitive inability of low-ability persons to recognize their own ineptitude. Without the self-awareness of metacognition, low-ability people cannot objectively evaluate their actual competence or incompetence.[1]

Like attracts and retains like, all 'in good faith'. Combine illusory superiority with political power, money and belief in the all cure Doom insect spray and you get a pretty accurate picture of a mess. A huge mess.