This has actually been brought up in a few situations to some prominent religious leaders (a good example was the former pope, only the direct statement after this, not both, the second was stated by another priest and agreed upon by multiple others, however I forgot the name, he was interviewed on both questions and more, if you know the name of the man then speak up) and in such a situation it would be fine to kill the guy. There are a few situations that this can apply to, for example; if you're pretty much wearing rags and really need some new clothes just so that you can keep going then it's OK to steal some clothes if there's no other real choice, but you don't try and go after the most expensive name design shit, just go for something small, don't take more than you need.
Me personally, not only would I shoot the guy, I'd pump every single round into the worthless son of a *****.