https://en.wikipedia.org/wiki/Plea_bargaining_in_the_United_...
We make legal education very hard, very thorough, we teach prospective lawyers about subtle nuances of law, guilt, evidence, bias, epistemology even. We make them do mootings.
Then we say lawyers are the very people who cannot sit in juries, and instead random people are to judge. Actually worse than random - people who have better things to do try to get out of it, or are resentful that they couldn't.
It's a bit like having highly educated doctors explain symptoms, possible diseases, as well as a crash course in biology, immunology and statistics to a panel of randos, who then vote on the best treatment for the patient.
Its only slightly worse than judges and prosecutors under reelection pressure though...