Key word is "defend".

As I said "not red tape", if you think you need to shoot someone to defend yourself, your family or your property, then that is justifiable.

AND irrespective of whether it is in your home or in a public place. One of the three cases I mentioned in an earlier post, was in a petrol station, a man happened to have his target shooting pistol or he was an off duty security guard. In either case he was not legally able to carry a handgun at the time. The fuel station was robbed, and he shot the armed robber as he ran past him after holding up the counter. He was acquitted of murder or unlawful wounding. He would have argued he felt personally endangered and perhaps he was carrying his handgun as he didn't want to leave it unattended in his car when paying for the fuel. (NOTE - definitely not providing any sort of legal advice here! )

If someone knocks on your door, it opens by itself, not being latched properly, and he walks in saying "hello, is anyone home?" and is promptly shot because he is a stranger in your house, Is that defence or murder. Obviously not defendable at all, but murder or manslaughter. (the your, you etc is meant generally for the reader)