Using lethal force to defend yourself from lethal force is not, in my opinion, "acting hastily". If you're talking about using lethal force as a reaction to just property crime, though, I think that is morally indefensible.
Well, I think there is also a gradient in terms of acts such as the main subject matter, and it's worth thinking about.
Where do you draw the line of it being 'just property crime' though?
It only matters where your state draws that line.
Just because your state draws a line doesn't make that line just.
Are you replying to the correct thread? It’s “just” as in “only” not “just” as in “justice”.
Regardless of your personal feelings if you kill someone in defense of yourself or your property it’s going to matter a lot what state you did that in.