You can’t.
Which means we make the decision based on which of the parties tells a better story.
Somewhat of a problem when various of the parties are professional actors.
Actually it’s a problem anytime. Unless someone can explain a way to reach an honest verdict of “guilty beyond a reasonable doubt” based solely on one person’s testimony that is directly contradicted by another person’s.
And is these supposedly happened in the early 70’s.
Over 40 years ago !!
It now becomes a numbers game. Over a dozen women vs one man.