My neurons made me do it - it is not my fault.

Its not me its my Neurons.
This was the title of a very interesting lecture I went to last week at the Science Festival.
One speaker was a top philosopher and neuroscientist and the other was a top barrister and expert in the law.
Can we really blame bad things that we do on our neurons (our brain cells) and claim it is not our fault?
or
Do we do bad things because we are bad?
There wasn't really a definitive answer but there was lots of fascinating information about the brain that caused much thought.
What should happen if a normal law abiding man develops a brain tumour which causes his behaviour to change so that he becomes sexually attracted to children and his ability to control himself becomes poor.
Is this his fault?
What should happen if he makes a pass at a child?
Lock him up - to protect society?
What about a diagnosed psychopath who has not yet committed a crime but who almost certainly will?
Lock him up - to protect society?
Is a psychopath mad or bad?
The barrister explained that the law is made by society to suit society so that it can function properly as it wants to.
So - a man who has acted on an impulse to sexually molest a child would be put away from society to protect it's children- regardless of the fact that it was definitely the fault of his neurons.
The psychopath - as yet society does not lock up people who might do something but as yet have not.
Although
Society does lock up some mentally ill people suffering from schizophrenia who are deemed to be either a danger to themselves or to others but who have not as yet done anything wrong.
No-one has ever been locked up because of the result of a brain test such as an MRI or fMRI
and yet these tests can now give some fairly good pointers.
Research on prisoners applying for parole has shown that an area of the brain called the anterior cingulate is different in the majority who re-offend.
So
A day may come when all those applying for parole will be scanned and parole refused on the basis of the scan findings?
Perhaps a day may come when all children will be scanned at age 5 and  only those with Ok neurons admitted to normal school. The rest would be sent to some special school where  they would get intensive remedial help. They would, for instance, be given strict boundaries and be taught impulse control and anger management.
but
Can you teach morality if it is not there?
Can you teach empathy if it is not there?
What do you do if someone is just BAD?