Some of the posts in this thread reminds me of an old Red Dwarf episode. The suicide squid one, with the dystopia in which people are shot dead for stealing an apple.
That's just not on.
We all know that bullets cost money, it's cheaper to hang them, the rope can be reused.
Back slightly on topic, in this country amazingly enough we do have the right to self defence, up to and including lethal levels of force - as long as it's "reasonable" under the circumstances, as could be argued for any reasonable person given what they know at the time*.
And despite the DM, and some users on here who seem to think that you're meant to sit back and enjoy watching your family getting killed and your granny raped because the police will put you straight in jail for so much as saying "boo", Tony Martin's case is about the only one in decades to result in someone going to gaol for "defending" his house, because he didn't act in a manner that the CPS, the Judge or and this is fairly important, 12 members of the public** thought was reasonable.
*And oddly enough some of the same people who jump to the defence of Tony Martin, and go on about how they should have the right to kill anyone who looks at them funny (slight exaggeration), also massively criticize the police when they end up being involved in a fatal shooting of an armed idiot***.
**Those 12 members of the public will almost invariably find almost anyone not guilty in self defence cases that involve home owners (indeed they've found it so in cases where police officers have been killed by a home owner confronting an "intruder").
***Defined as anyone who waves a gun around near police officers, especially when they point it towards armed police officers.