Fraud does exist, obviously. And fraud has been argued, in court, and elections have been overturned, or re-done. However, for an election to be overturned, or redone, fraud must be argued, and won, in court.
And most people don't know, but Trump has never argued in any court that fraud took place. Look it up, not once, ever. To legally argue fraud, you must wait until the election is over, indicating you lost, so that you can have the proper standing to argue the election RESULT was fraudulent. That is why Kari Lake has been waiting to file her cause in Arizona accusing that fraud took place, because she has accepted the legal advice that a fraud charge can only be made after the initial result has been completely certified and officially announced. Meanwhile, all of Trump's actual cases were just trying to get ballots thrown out, such as all mail in ballots in certain states.
Trump and his legal team knew this, which is why he never filed any actual accusations of fraud. Instead, he decided to wage a PR war, instead of a legal challenge on January 6, that he is still waging. PR wars affect PR, both positively, and negatively. They do not result in fraud charges being heard and decided in a court of law. And without a case ever being made in court that fraud did exist, no election will ever be legally reversed, or re-done. He's completely trying to put the legal cart before the horse, in a PR campaign. Which is mainly why no lawyers want to go near him.
More importantly, is that it proves election interference employing fraud occurred. It would be hard for the Supreme Court to ignore the case.