It takes a ''special type '' of person in all reality to report and stand up as a witness ,then carry on living on the criminals doorstep.The OP confronted the guy,and that should and will more than likely be it.
It's different behind the key board,however in reality not everyone would put their necks on the block,it's the way human nature is.
As I say he's done his bit,hopefully it goes no further,for the sport /the bad news frenzy and his own right to a peaceful life.