Breh, you think that child roaming into that yard was the root cause, but that dog could have attacked anyone at any point as soon as it got the opportunity.You don't understand root cause. it's ok. I understand.
That dog was bound to harm or kill someone at some point. The root cause is a dangerous animal who just needed a single opportunity to attack.
The root of the problem is that the dog was prone to violence from the start, it was only a matter of time before someone got hurt.
You must be retarded thinking that the child walking into that yard made the dog dangerous.