Psychologists have postulated there is a dark factor, correlating with dark elements of personality: narcissism, ego, selfishness, sadism etc.
Trump seems to embody the D factor, as revealed by his behavior and Mary Trump's book. Joe Biden was right to cast the election as one between light (himself) and darkness (Trump), and I think in conversations with others that should be emphasized as much as anything why you support Joe and not Trump.
The frame: The election is between light and dark.
Here is an article:
https://getpocket.com/explore/item/the-dark-core-of-personality?utm_source=pocket-newtab
A website:
http://www.darkfactor.org/
A quiz you can take to determine your D score:
https://qst.darkfactor.org/
These are the nine traits that comprised their D-factor:
Egoism. The excessive concern with one's own pleasure or advantage at the expense of community well-being.
Machiavellianism. Manipulativeness, callous affect and strategic-calculating orientation.
Moral Disengagement. A generalized cognitive orientation to the world that differentiates individuals' thinking in a way that powerfully affects unethical behavior.
Narcissism. An all-consuming motive for ego reinforcement.
Psychological Entitlement. A stable and pervasive sense that one deserves more and is entitled to more than others.
Psychopathy. Deficits in affect, callousness, self-control and impulsivity.
Sadism. Intentionally inflicting physical, sexual or psychological pain or suffering on others in order to assert power and dominance or for pleasure and enjoyment.
Self-Interest. The pursuit of gains in socially valued domains, including material goods, social status, recognition, academic or occupational achievement and happiness.
Spitefulness. A preference that would harm another but that would also entail harm to oneself. This harm could be social, financial, physical or an inconvenience.
I've added a poll, in case you want to self-report your own D-factor if you take their quiz. We can all guess that Trump is close to 9.