Why are some places haunted and other places, that by all history should be, are not?

In my hometown of Vincennes Indiana, there is a central park that has been the scene of several suicides, an abduction, a tragic accident involving a 3 year old girl, and who knows what else (I'm just relaying what I know first hand from living there)  I have never heard a peep about the park being haunted.

Down by the river near the Illinois/Indiana border and by the university is another park that should be haunted.  A partially embalmed body of a known gay boy ( who was a classmate of mine in the 80s) was discovered. An investigation never went anywhere.  You'd think that would be a motivated spirit!  There's also been at least three suicides and two murders at this park that I know of.  Again, I haven't heard anything about a haunting.

Both of these places have the histories.  One is near water and both are built on limestone.  What do you think?  I think the next time I am home (Memorial Day weekend) I am going to take my kit and go investigating.  If you are near Vincennes, you are more than welcome to join me.