If you absolutely rely on something to live (without an ozone layer or oxygen, you're gone), don't you have a right to defend it? Although I admit, using robots

If you absolutely rely on something to live (without an ozone layer or oxygen, you're gone), don't you have a right to defend it? Although I admit, using robots to kill billions of people would give me pause. It's definitely a complex issue. Do you have the right to defend yourself against an indirect attack? Here's another ridiculous scenario to think about - let's say you're diabetic, and some group of thugs is destroying all the world's supply of insulin. It doesn't belong to you, but you definitely need it. What would you do?