Having something taken from your possession is a horrible feeling. The powerlessness and lack of control that it evokes are truly devastating. I experienced this recently when I was burgled, and my bicycle stolen from my hallway. I loved that bike. I had only had it a few months and never thought to lock it whilst it was hanging on its rack in the hall.
Having lost a bike, and experienced the volcano of emotions in the wake of the realisation that I may never see it again, I am still a long way off being able to truly appreciate what it is that the friends and families who are left behind when someone disappears go through.