Trump acting in bad faith, saying whatever he wants, and strutting around like he’s above the law are all things that severely undermine his legal defense. He lost the rape civil suit because he so thoroughly demonstrated his shitty character. Incredibly damning evidence is admissible because he’s lost attorney client privilege thanks to Trump and his attorneys engaging criminal and fraudulent activity together. He’s constantly feeding new evidence to the prosecution by making public statements that contradict his previous statements, are incompatible with his defense, or even just admit to facts which support the prosecution’s case.
The prosecution needs an ironclad case because this has to stick. We can’t afford to leave room for appeals, or for a friendly judge to to find an excuse to get him off the hook. We need a case so overwhelming that even a rabid MAGA supporter in the jury will be unable to stomach a not guilty verdict. It sucks, but there’s no getting around it.