Demonstrating that someone is an idiot, talking out of their ass, constantly contradicting themselves, making no sense as they toss out their word salads, transparently lying, then insisting they are not the liar, (you are!), that they get angry rather than answering simple questions, and so on, is not hard to do. An idiot speaks for himself. All you really need are a handful of their quotations in context to prove your point. Still, what do you actually gain by proving someone is an idiot?
A charismatic or powerful person who is an idiot gets admiration, and a pass for being dumb, by people who fall under the spell of the admirable idiot’s performed personality. You will not change the mind of anyone who follows, or even worships, an idiot, by offering proof that the object of their fandom is, in fact, an idiot, cretin, imbecile or other person of sub-average intelligence. Having true faith and personal loyalty means that you are impervious to “rational” arguments against the indisputable truth of the thing you fervently hold dear. There is no objective proof that can make a dent in true belief.
So the argument about a malicious idiot who is also loved goes round and round and there is no exit from the cul du sac of that senseless, unresolvable debate. In the end, it is idiotic to expect to prove to someone with a closed mind on a subject that they have been influenced by an idiot and that their belief in the idiot is, uh, not smart.
Belief, like other strong feelings that give meaning to our lives, is not really subject to proof or disproof. The end of an argument over beliefs, with a certain percentage of offended believers, is a punch in the face or other outburst of violent indignation.
When we observe that certain people we encounter are idiots, and we are in forced contact with them, it is best to stay away from topics that might provoke them. Avoid anything but idle chitchat, smiles and good natured jokes and everything is generally more or less OK. It is not hard to be pleasant, even if you sometimes have to be somewhat false.
Of course, moral idiocy is not limited to stupid people. We also see very intelligent people who lack empathy, are stubborn, cruel, manipulative, vindictive etc. Idiots have no monopoly on being assholes, it’s a character flaw that works across the spectrum of human intelligence. Even though it’s hard to do sometimes, it is better, I’ve found, to avoid arguments with anyone, smart or idiotic, who shows you they will never, under any circumstance, actually take in what you have to say and give you a thoughtful response.
I have learned this seemingly simple lesson the hard way, and paid a high price for the understanding I have now, an understanding I remind myself of by writing things like this. I offer it to you for free, for whatever it may be worth to you.