Animal abuse is no joke for sure. However, I'm not sure that it rises to the level of repetitive child sexual abuse. Also, I agree that a chimp would fight back and it would be a heck of a fight.
My dog would attack and cause great harm to someone who went for my Mrs or likey Me -
As Most People’s dogs would.
Their owners sometimes abuse their dogs without them attacking them
It’s quite possible it was like that with his monkey.
Though him being a weirdo Peadophile I don’t see the connection
There may well be a connection between animal abuse & being a Peadophile
Though I’m not aware of it.