Well we can't say he didn't do anything strange. Firing huge portions of the state department to replace them with loyalists, attempting to dismantle the EPA (the only agency keeping track of aging nuclear submarines and, you know, that whole climate change thing), exiting the Iran nuclear deal for essentially nothing. Those are just from the top of my head but apart from the constant social faux-pas being signal boosted to the entire world, there was a very long chain of legitimately frightening actions that led to fears about him being relatively justified. Then there's the whole "big lie" and all the actions leading up to it. No one could rightly say he _wasn't_ attempting to seize continued power. I don't think it was like a full military coup, but there were definitely concerning actions