In the many personal injury trials I've been involved in, we have frequently seen a juror cry. Working for the defence, I'll sit there and say oh, we just lost that juror. They're going to vote for the plaintiffs. Lo and behold, they're able to separate that out. We find out afterwards that they voted in our favour.
The crying and the emotions you observe are just human emotions, and some jurors are able to separate that out.