It is difficult to have a completely unbiased jury. The text mentions a few things that influence the jury’s final judgement. One of these things is how similar the defendant is to the jury.
I recently had the experience of being part of a mock trial for one of my other classes. A few of my other class mates and I made up the jury. When the defendant stood up to tell his story I realized that it was one of my coworkers Tom. Tom and I got along well and had a lot in common. I listened to his character’s story and realized that i would have acted in a similar way. So I had a lot in common with both the character being played and the actor playing the character. It’s no surprise then that I voted in favor of the defendant.
Even though this was a mock trial, it still shows how the similarities between a defendant and a jury can bias the jury’s final judgement.