Your position relies on the assumption that everyone who died would remain behind as a ghost rather than, as some believe, only those with some unfinished business or a reason or a cause end up remaining behind as a ghost.
And I also did say ghost or demons. I would not swear to what or which could be hanging around here.
I can understand your position of; "i'm not calling you a liar, just i have to see with my own eyes to believe." I said the same thing until I was roughly 40-years old and then began to experience the inexplicable in my own home and have it continue now for 18-years.
That sort of thing doesn't happen to most. But to those it does happen to, they are forced to accept that there is more than the eye normally sees and the mind normally is willing and capable of accepting.
Two friends of mine, longtime friends, will no longer visit me after the scares they had here. After being horrified one of them slept in his pickup truck in my driveway because he would not spend the night in my house. He left the next day as quickly as he could load up his things and go.
In neither case did I tell either of them ahead of time about my house, so it was not like a seed was planted in their minds that caused their imaginations to run wild. They just experienced things they were not capable of dealing with, things that were outside the limits of their beliefs.
Myself, I enjoy the things that occur here. I find myself wondering what will happen next. If it will be something new or one of the things that have happened many times and are almost common occurrences. If something doesn't happen for a while I am actually disappointed and hope it will not be long before the next thing happens.