I would like to know about possiblities of people whether you believe its unfinished business, suicide, or just plain stuck. What do you feel happeneds?
Most people would probably state that it is every possibility you quoted, personally I think that in many cases people get attached to an area, be it a house, piece of land, or an object and when they pass on they simply cannot or will not let go of that for whatever reason.
Another thought I have about why they are still around 'our plane' of exsistance is that their life was taken quickly and they just don't know that they are dead.
Maybe others could post about this and we could all see what the general consensus is.