Because articles like this tend to bring out the worst in humanity.
Ironbite-seriously the worst.
So do alcohol and drugs, as was proven in this case.
Seriously, especially in Finland it seems like most of our homicides and fights are caused by alcohol and/or drugs. Childhood friends stab each other to death over a silly argument after drinking too much.
Even in this case, the original argument was a dickish move, teasing a guy over the death of his father. Not an justification for shooting him, mind you, but still a dick move.