It is a sad situation, particularly sad in todays age that it was allowed to escalate to the point that an elderly gentleman feared for his life. Under the law, his actions may very well have been justifiable because under NZ law you are allowed to use equal and opposite force if you fear for your life, or those around you, particularly on your own property. It is now up to the court to decide if he feared for his life.
As for mental health issues, all I've seen so far is an old guy that enjoys having live pigs on his property, bit of a recluse, but well spoken and very popular. How he decides to live or how any pigs he may have doesnt constitute a "mental health" issue - hes just different to how you and I choose to go through life. The justice system also needs to be very careful that perceived "mental health" issues dont preclude the poor guy fearing for his life.
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