You know your son’s a werewolf, and you know exactly when the full moon occurs.
Why then do you not chain him up in the garage with either half a cow or a live goat, thus sparing everyone his rampage?
The trick is to have something to occupy his need for bloody mayhem. Something he’ll enjoy. (But try to mix it up, and don’t always place it in the same part of the garage. Keep it interesting.)
In other words, give him something to rip limb from limb, something he can thrash apart with his mighty jaws.
There’s really no excuse for failing to do this. Especially with grants and all those goat subsidies.
