the family admitted that the victims was constantly being bullied, so good chance for suicide there too
Or, the victim was constantly harassed until being found hanging from a tree, so there's already a motive and likely a handful of suspects
According to the CDC about 12,000 people a year hanged themselves
Any estimates on how many did it outdoors, where they're likely to be interrupted? See, this is the suspicious part. Basically no-one ever attempts hanging in public. Here, you have seven people over a year and the police just shrugs.

