During the period of turmoil just before and after the 2020 election, when an increasingly belligerent and angry Trump kept insisting that he could only lose if there was cheating and would not state that he would go along with the peaceful transfer of power if he was declared the loser, there was increasing alarm that he would try and stage a coup rather than leave office. I personally thought that this was unlikely and said so in June before the election and in November just after the election.
The reason for my skepticism was that in order to carry out a coup, Trump would need the support of the military and I could see absolutely no upside for the US military to get involved in such an attempt. Other than so-called palace coups where a group of insiders edge out a leader by some means and replace them with another insider, most coups require actions by the military to seize the major organs of power and the media, arrest opposition leaders, and patrol the streets to quell any nascent opposition. A simple cost-benefit analysis would tell the top US military brass to steer clear of any such move. The potential cost is very high, since if the coup attempt failed, all the officers would be charged with treason. The potential benefits are nowhere close to being worth the cost since the US military already does very well in terms of broad public support. The top military brass get treated very well and have all manner of desirable perks. Both major parties fall over themselves to see who can be more generous in funding the military, sometimes giving them even more than they ask. Why would they risk a very cushy gig by breaking all prior norms and coming down on one side, especially when that side is led by an utterly erratic, irrational, and narcissistic person like Trump? This situation is quite different from that in countries where successful coups have taken place, where the military thinks it has much to gain by taking over the government or aiding a politician in taking it over.