It's a lot easier said than done. In those kind of situations anything is possible, just because you might not see a weapon doesn't mean that they don't have one or that they can't get one. If you have actual training and are confident in your ability to keep a level head and use measurable force then sure go for it, but nobody should be expected to perform what you're saying in a high risk situation with an adrenaline rush.
of course it is, I just find it wrong to shoot someone fatally when I can see they are presenting no physical threat. I haven't been burgled as I live in quite a secluded area so perhaps I am looking at this through rose tinted glasses, but personally I would not simply shoot someone just because they are in my home
"On the evening of 20 August 1999, two burglars –
Brendon Fearon, 29, and 16-year-old Fred Barras, both
Irish Travellers from
Newark-on-Trent,
Nottinghamshire[8] – broke into Martin's house.
[9] Shooting downwards in the dark with his shotgun loaded with
birdshot, Martin shot three times towards the intruders (once when they were in the stairwell and
twice more when they were trying to flee through the window of an adjacent ground floor room). Barras was hit in the back and both sustained gunshot injuries to their legs. Both escaped through the window but
Barras died at the scene.[10] Martin claimed that he opened fire after being woken when the intruders smashed a window. "