The federal violent crimes act should have funds for some of their costs. Some of them have insurance through their employers, some took out travel insurance, and a few are military. Eventually, the law suits will settle things and what they don't cover I heard that the casino/hotel organization was going to pay.  The concert folks had insurance too so they most likely will pay up too. The real cost is to their mental health and the stress and depression that their loved ones are going through. Their lives are changed forever.