You can guarantee pretty much every person in any given jury has vices we don't know about or strong pre existing opinions on the "type" of person they are judging. It's impossible to expect 14 or whatever it is randomly selected people to be entirely objective, even more so in this day and age where just tweeting the wrong thing on twitter 10 years ago can get you fired or worse. I'm not saying I know of a better alternative but the way AI is heading surely it would be better just to feed all the evidence into an algorithm to work out the verdict. I'd much rather be judged by a cold calculating logic machine, than some randomly selected people half of which probably have warped views on the world plus vices and prejudices of their own.