Really?
If an intruder broke into my home in the middle of the night where my family were sleeping and I shot that intruder dead I would be expecting a medal not 10 months in prison. I value the lives of my loved ones a lot more than that of an intruder.
You may be expecting a medal but the reality is that you too would be going to prison if you were in SA. There is no "stand your ground" defence in SA (or Australia). OP knew he was breaking the law when he fired through the toilet door
Sean Rens of the International Firearm Training Academy was in charge of the assessment OP had to undergo in order to purchase and own the firearms he bought. He had to complete a Unit Standard questionnaire which included the following questions:
Q.2 You are at home alone in an isolated area, far from police or security services. You happen to look out of your window and you see two strange men jumping over your wall and make their way towards your house. You do not know these men and you are not expecting any form of visitor because it is very late at night. Have they committed an offence that justifies the use of lethal force against them?
OP correctly answered No.
Q.3 The men come to your house and proceed to break off the burglar bars of one of your windows and enter your house through the window. They go to your lounge and they start to remove your extremely expensive hi-fi. Can you discharge a firearm at them at this point?
OP correctly answered No.
Q.4 When the burglars who are stealing your hi-fi become aware of your presence, they turn and they order you to go away or they will kill you. You are behind a security gate 10 metres away. Can you discharge a firearm at them because you fear for your life?
OP correctly answered No.
Q5. There is no security gate between you and the burglars and they turn around and both are armed, one with a knife and the other with a firearm in their hands and they advance towards you. Can you discharge a firearm at them because you fear for your life?
OP correctly answered Yes.
6. Explain the legal requirements when using lethal force for private or self-defence.
OP wrote, The attack must be against you, it must be unlawful and it must be against a person.
He had been able to list the top safety rules. When asked to explain target identification, he answered, Know your target and what lies beyond.
He achieved top marks in the test.
It's a tragedy that he was ever issued a gun licence and owned a weapon. Not everyone is a fit and proper person, and clearly he falls into that category.