a) Not what was said. The argument put forth was:
No mention of violence. The individual who argued this is anti-abortion because their stance is life is sacred.
b) This is definitely a thread where absurd goalpost shifting is strongly encouraged. Even doctors say so.
This story is of someone robbing a store. This thread links to another thread which has a story about a burglar.
Robbing a store. If the robber robs the store while there is someone in the store, and it is anything other than trying to be subtle and shoplifting, the robber is threatening the store employee. It is that threat that the employee responds to.
Burglary. If the burglar robs the home while there is someone in the home, then burglar is threatening the home owner. It is that threat that the home owner responds to.
If you think you can stand by and take pictures of your stuff while the burglar carts it off, you're nuts.
Again, that is not what Half-life said. And just so we are clear, I personally don't have a problem with someone getting shot at whilst robbing a store and imminent violence is apparent. All I am trying to ascertain is how the arguments the OP is making are rationalized by the ethics the poster allegedly has.