That just takes us back to the inevitable "Republicans are evil and want to make the world terrible, but they're just too stupid and incompetent to pull it off". When there is a rational explanation for someone's behavior, it's not always the reason, but it is the one most worth believing is the reason, particularly when the alternative requires some rather extreme assumptions.
We're not talking about "Republicans" though, are we? We're talking very specifically about Donald Trump. So, if we want to be rational, we can consider the case that Donald Trump is possibly ignorant about a lot of the things he talks about, and examine the evidence.
Donald Trump has a history of claiming things which are ludicrous, unfeasible, illegal, etc. Whilst much of this is his Herculean propensity for bullshit, plenty of instances suggest he may genuinely have a poor understanding of what he is talking about.
He has frequently made seemingly serious claims about presidential (or in terms of election certification, vice-presidential) powers that no-one outside his own fringe lawyers recognises. He announced on TV that maybe Covid could be treated by injecting disinfectant or somehow shining a UV light inside people's bodies. I draw your attention to
this little gem, which strongly suggests Trump doesn't understand the negotiations process. This is within a context of wider stories that he
often does not attend briefings, or
does not seem interested in them. And we can also consider the quality of information he is receiving, because he often seems to surround himself with dubiously competent advisors.