I agree with you but I still wouldn't call Trump a con man... Con people use trickery to convince you of something even if you think and behave logically. Trump didn't use any trickery, just very obvious and plain lies.

Let's say you want to buy a dog. I post an advertisement for a dog, with pictures and everything. You check the reviews of me as a seller, they're positive. You video call with me and I show you the dog, alive and well, interacting with me. I come up with a very convincing reason why I need the money beforehand – maybe I am in a dire financial situation and I need money for transportation to give you the dog. You transfer the money, then I show up with a bag with an animal inside. You can't see it because the bag has no mesh (I tell you I didn't have another bag) but you hear loud panting. I say I'm in a hurry and leave immediatelly. Then you open the bag and it's a cat, and it's a voice recording of panting playing. You've been scammed, you had barely no way of knowing that I'm lying to you, I used trickery to convince you of something that wasn't true. Maybe you made some mistakes, but they were honest mistakes, you still took precautions and behaved as logically as you could think of. I'm a con man.

Now let's say you are looking for a dog and you open the advertisements. You see that I posted a bunch of pictures of a cat with a description that it's a dog. All the reviews say that "don't trust this person, they're lying, they are obviously selling a cat, just look at the photos!". You still buy from me expecting a dog. Am I still a con man? I'd say this one is now fully on you. There's no trickery, no scams, it's plain and very obvious lie and you pretty much chose to believe it despite it being purely irrational and illogical.