You have just doubled down on the circularity.
Fun, that...
It is simply your opinion that the Republicans 'didn't want to find out the truth." After all, they had the transcript and the Democratic witnesses. The implication here is pretty simple; if the Republicans had witnesses that would utterly exonerate Trump, they would have been deemed false and unreliable...and not admitted.
Besides which, how can a witness exonerate Trump from doing something that EVERYBODY acknowledges wasn't a crime, much less a 'high crime or misdemeanor?"