This nut’s father was a DR. Why did he not get the boy help???
Assuming his son had severe mental problems, being a doctor doesn't mean that he might have any better luck at getting a family member to go for help than anyone else. Additionally, some psychiatric medicines are very harsh on the body, many don't work on everyone, and the side effects can be very difficult to handle. Some people, even though they follow through with appointments and taking their medications, never find the right combination to keep them well,
Getting a mentally ill family member to follow through with medications that are difficult to take is really hard and sometimes impossible. From family experience, I can tell you that unless the parents did nothing at all, they really can't be blamed. You can't force a 24 year old to do anything, even if they are severely mentally ill. Adults retain the right to decline medication and other treatments, even when they are not in their own right mind.