And this is exactly why other ongoing cases are, generally speaking, not admissible as evidence. Someone doing something bad once doesn’t mean that they did it twice. Multiple accusations doesn’t mean that they are guilty. Otherwise, a simple conspiracy to bring multiple charges at once would be absolutely damning to a defendant.

Also the pre-trial stuff is pretty much just to show that there was an applicable law that may have been broken. It has almost nothing to do with whether or not the defendant is guilty, liable, or otherwise found at fault.