"Two dozen victims crowded one side of the courtroom, with some of them staring daggers at the Chechen immigrant. Among them was Heather Abbott and Marc Fucarile, each of whom lost a leg in the attack." - Bev Ford, Corky Siemaszko, "'He believed he was a soldier in a holy war against Americans': prosecutor opens trial of accused Boston Marathon bomber Dzhokhar Tsarvaev," in the New York Daily News, March 4, 2015. Here is the article.
It is shrewd and not unexpected to have the victims in the courtroom during opening arguments. No one can resist the heart-breaking pull force of that physical and emotional tragedy. Of course, that's within the visual field of the jurors.
The impact of the content of the prosecution's opening remarks can be just as devastating to how the world, including the jurors, perceive the defendant.
Assistant U.S. Attorney William Weinreb noted that Tsarnaev positioned himself behind a bunch of children near the finish line. Afterwards when he returned to the University of Massachusetts Dartmouth, he posted on Twitter:
"I'm a stress-free kind of guy."
Depicted is a creature devoid of human feelings. It would be all too easy to sentence him to death.