This is the best description (on the web) about narcissists, the people who are the world's most dysfunctional and dangerous leaders. Joanna Ashmun's great web pages describe dismissive, "covert aggressive" politicians like Trump and many others to a "T".
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many politicians have this illness, NPD. They are pathological liars, narcissists.
This is a video, the first in a series on people with NPD, a cognitive deficiency, that makes people delusional.