Nicole Hockley's son, Dylan, was killed in the Sandy Hook Elementary School shooting nearly 10 years ago. She writes for @usatodayopinion: My heart bleeds for the parents whose children are not coming home and for the families of the adults who also won't be coming home. I’m overwhelmed with compassion for the Robb Elementary School community that will never be the same because of the void left by 19 innocent children and two adults. Whenever there is a tragedy like this, I am re-traumatized. I relive the murder of my son, his classmates and educators. The sadness and anger are crushing. To read more of her column, click the link in our bio.