In merry old, you can be sued by thieves if they trip over a carpet in your house while robbing it and hurt themselves...

If your a privileged and can afford to own a shotgun legally and you surprise a thief who is armed with a machine gun (illegally, of course) and the poor fellow dies, you can be prosecuted with murder...

Of course we here in the comment celler are not lawyers or any such thing so this is not legal advice and YMMV...