The fact that Brian Wilson had schizoaffective disorder (combination of bipolar and schizophrenia) and it must have been hell dealing with Wilson behaviour

I have seen personally the difficulties of Relatives and friends of people with schizophrenia/bipolar and it's incredibly difficult. On one hand you try to be understanding, sympathetic to the person because they are unwell and it's not really their fault. However if the person has an acute psychotic or manic event or an underlying paranoia that is present all the time even if you sympathise with their illness if that person is behaving badly to you and your family because of the illness, there's a point where you going to say i shouldn't have to take these abusive, destructive behaviours and cut ties with them and this is understandable.

I have no idea what Brian Wilson behaviour was when he became manic or psychotic. However I have witness other people with same conditions where when they become psychotic they get paranoid delusions and believe their family member or friends are out to get them and has stolen their money and go about threatening them.

I have also seen people with mania which characteristics are impulsive behaviour where they often go on a spending binge. Sometimes theft is involved or sometimes you have to clean up the aftermaths such as rescuing them from their own financial situation by giving/lending money that you know they are not going to pay back and obvious conflict

It's a tough feeling of dealing with shitty behaviour but knowing it's not really their fault because of illness and relatives and friends of mentally ill people often have very conflicted opinions on those people