That is why one uses multiple witnesses. The accounts of three other woman that were attacked by Trump were used. There were even more, but those three were enough. Carroll's claims of telling friends was corroborated. Trump himself shot himself in the foot and showed that he was NOT honest. You keep trying to limit the claims to just Carroll and Trump and that is not the case. That is why your argument was a strawman argument. If it was just those two then you might be right. I almost said "would" but you cannot ignore the fact that Trump showed that he lied when he described Carroll.
Tell me, was there only testimony from Trump and Carroll in this trial?
Do you know what real evidence is?
Real pieces of evidence are Trump's DNA on her clothes.
Or a footage that show that Trump and Carroll enter the megastore on the day X.
She doesn't even remember the day of the events. That's very bad.
As for the testimonies, I can take them into account. They are interesting, but they are insufficient evidence (art. 530 Penal Procedure Code), and a person shan't be condemned unless their responsibility and accountability is proven beyond any reasonable doubt (art 533 Penal Procedure Code)-
Source: Italian Criminal Law