One more thing Trump refuses to get is that whoever becomes President during the swearing in ceremony remains legal president even if it later turns out that there truly was some epic fraud that brought them into office. They could be impeached or whatever, but until then they’re the one and only legal president. The reason for this is the stability of power. Any new president doesn’t have to worry about whether or not they will be retroactively declared illegitimate due to pure political shenanigans and thus all of the laws they signed etc.