Maybe grandma was an nasty old bat that beat him with his cane...
His parents maybe don't want him because they are low life scum sucking dogs that don't give a damn about anything but themselves...
The kid may just be mentally insane and in a civilized country these people are institutionalized ...not executed for their crimes since the definition of insanity is you do not know the difference between right and wrong...
Should he ever breath the free air again...No
If he is judged to be mentally fit...lock his ass up forever...
Imho, it doesn’t matter why this boy is a psychopath, it only matters that he is a danger to society. He can’t be allowed to have any opportunity to kill again.