The thing about wanting to kill the leopard that would have killed a child in Uganda is absurd from many points of view. For example: they say they do it because it is primed. But there is no certainty that he has eaten human flesh, because another larger predator could have taken his prey away. 
Also, how will you know which leopard attacked the child? Will they open their stomachs to each leopard they capture? The reasonable and civilized, is to improve security measures in parks and towns. Learn to live with wild animals. Do not start a ruthless hunt, which is just an abominable act of revenge.