Sorry to butt in here, but I would like to share my thoughts if I can have a little of your time. Now when someone is struggling and perhaps paranoid their behaviour can become somewhat erratic as they get triggered. Personally (and please bear in mind I'm not a health professional etc), I think stability and security reign more important than the outward displayed behaviours. Understanding and reassurace can be a calming influence, but it's a process that takes time. For example showing kindness to a abused animal takes time before gaining their trust. Criticism etc. might lead to barriers in communication and achieve nothing else besides resentment and rebellion. I wonder if he has any support teams etc. Perhaps these are the people who need approaching for advice, support and help etc. aswell as taking some of the responsibility/burden off your shoulders. I hope this has been of some help.