The Tsarnaevs were terrorists, self-activated. Your premise if false.
CCWs save their own lives and the lives of others far more than they unlawfully take anyone else's. By wide margin. It's actually a newsworthy event, after all, when a CCW does something even perceived as unlawful with their gun (and may still not turn out to have been, such as the Sanford case). In other words, a CCW going off the reservation with their CC weapon is a
"man bites dog" story; a CCW using their weapon legally to prevent themselves or someone else being the victim of a crime is pretty ordinary and mundane, news-wise.