. >> reporter: but unlike other diseases, slutkin says gun violence is the one epidemic that public healthving. >> the bread and butter of epidemic control is to find rare events in the community and to stop them from becoming full-fledged events. >> reporter: today a moment of silence at the growing memorial in front of the school. as the familiar thoughts and prayers and some calls for change once again echo, this last night from texas native kelly clarkson at the billboard music awards. >> and i'm so sick of moment of silence. it's not working. like obviously. so -- sorry. so why don't we not do a moment of silence? why don't we do a moment of action? >> reporter: isabelle is now at home with her mother, who says for them it's time to heal. >> i don't know what drove him to this. the problem is it sounds like nobody did. which means that we as a community or his parents or whoever, they failed this child at some point. and sadly this was the outcome. and i don't know the answers. i do know we need to figure it out as a whole. >> reporter: too many once again mourn their losses. like tho