I don’t think anyone was claiming juries are infallible. They are human and thus make mistakes. Same is true of judges. Prosecutors and everyone else in the system.
But to me, I give weight to decisions made by people (juries and judges) who sit through the entire process over someone who hasn’t. Hear all of the testimony. See all of the evidence. Listened to the testimony and observed the witnesses. Again, doesn’t mean they can’t be wrong.