Maybe they dont know because they are relying on science to explain something nonphysical, so it makes sense they wouldnt know.
It supports my argument more than it does yours.
It is a valid assumption since you cannot detect the will in the brain.
What you have are effects, not cause.
Can you or anyone re-create the human "will? or a machine, perhaps, that can intentionally choose to act contrary to the way it was designed to act? a machine like this one?
This would show that you at least have an idea of whats going on in the human brain regarding the human will.
I have no reason to believe there isnt a nonphysical component to the brain of those animals you described. Call it animal will if you like, because its certainly not human.
Its good to have a solid reference point in life to remind us of who we are and not think we are mere animals working off of mere electricity.
Evil is not just a matter of committing heinous crimes, its also a matter of not following Gods will.
There are some very nice people out there (perhaps you are one of them) who do not follow Gods will, and thats not good enough.
From Gods perspective,
all our righteous acts are like filthy rags - Isa 64:6.