If you are wondering why this particular criminal trial has gone to court while the three others are waiting for the Supreme Court to rule on whether a President is immune to all criminal prosecution or not, you should know that this criminal case predates Trump's time in office. Once he became President, he stopped law enforcement from continuing its investigation (and other investigations) and pardoned at least one of his conspirators who had already been found guilty. The trial has already been significantly delayed due to a variety of legal tactics that Trump's extraordinarily expensive lawyers have played out.
Now some people seem to feel that Trump has been unjustly targeted with these multiple indictments against him. They wonder why such a big deal is being made of this single $130,000 payment when he is a billionaire. I remind them that Al Capone--who was certainly guilty of extortion, murder, and worse--was only able to be thrown into prison due to tax fraud. In Trump's case, these court cases are the ones that are iron-clad. As is, the people prosecuting the cases have had their home lives torn apart, requiring protective services for them and their families as Trump has continued (even, most recently, in spite of gag orders) to attack them verbally in ways that his more rabid followers have taken as orders to terrorize, vandalize, and even hunt both the people and their families. If he was any other person, he would already have been placed in prison for his open contempt of the court system, let alone his threats towards judges, prosecutors, witnesses, and juries.
It is my belief that there is another couple of history-making titles still coming his way.