Yes, of course jurors have emotion and sympathy. But the purpose of a trial is not to compete to win that sympathy. Lawyers may aim to do that and it may naturally be part of a trial, but they can’t simply say “I’m gonna do X and Y to win sympathy from the jury.” They don’t have liberty to put on any show they choose - it is limited by the elements at issue and how the judge rules on the limits of what can be presented.