The interesting thing that your hypothetical doesn't say is that we all know and trust that Biden would order no such thing. But how confident are we that Trump wouldn't? We have testimony from former Trump cabinet members who stated how Trump wanted to do many illegal acts while president and the only reason they weren't done is due to ethical standards by the cabinet officials. We have reason to believe that Trump won't make this mistake again and will select loyal cabinet members who will follow orders. Will there be executions of enemies of Trump? It really isn't easy to doubt. I can imagine certain members of congress have sudden deaths that have strange causes, much the way certain putin enemies get poisoned with various agents. It's more likley that Trump enemies get arrested, as he has already threatened. What charges, what evidence? Well there doesn't have to be any evidence that is actually credible, the arrests will serve the purpose of intimiidation. Even when the charges are later dropped (because not all courts will have Trump loyalists) it will cause fear and chaos.Great question.
How about if in his official duties as President to protect the Constitution and the democracy from this Court, he walks into the Court and shoots six justices in the head, and then goes after Trump? Would those be considered crimes? Could he even be arrested or legally stopped from shooting if he weren't finished yet?
Something like that might save the nation from tyranny. The surviving justices and the replacement justices would probably revise that ruling pretty quickly.
ATTN MODS: I am not recommending committing a crime or shooting anybody. And that is not something that Biden or I would do. It's a hypothetical - could he be prosecuted if he did that? Maybe not.
We really have no idea how far Trump is willing to go, and no idea if those he installs will follow orders without question. Trump will have immunity, and the power to pardon. That means a president with zero accountability.