In situations like this one, it's hard to say what could have been done to prevent it from happening. He started shooting his own family, and who would expect that, and then went over to his neighbor's house and started killing there too. Again, not what you would expect.
Here's the part that I find notable in this whole thing:
Sims said that when state police arrived about an hour after the gunfire began, they heard a single gunshot and found Neace's body on the porch in the unincorporated community of Mount Carmel in Breathitt County, which is home to about 16,000 people.This is not a knock on the cops; it sounds like a remote part of the state, and who knows how long it took for someone to place a call. I point it out because calling the cops is not always the quick answer to a problem. Sometimes you may be on your own for awhile.