He tried to subvert the last election and appoint himself the president even though he lost the election.
He put in place a SCOTUS that has declared he can order seal team 6 to kill his political rivals and that action would be protected from criminal prosecution. Or selling pardons. Or taking bribes. On and on.
So, yes, he has done things that are FAR different from all past leaders. Either of those is sufficient.
But worst of all, he created the Trump voter, people that are so disconnected from reality that there is nothing left.