Then they get nuked back and they all die? Like how does that answer means anything?

"nuke us and get nuked back" means we all die. Push people to the point where they're dying anyway and they might not see taking you out with them as a bad thing.

You're a whole lot safer when the people around you can get enough food and water. We already have solutions that don't involve putting entire nations at risk of dying off in large numbers. The problem is that those solutions would eat into the already massive and growing profits of corporations who would sooner put your safety at risk than take even a small hit to their unsustainable growth.

They won't do that because it makes no sense. They will just complain about it and maybe refuse to trade or do some cyber attacks.

No one would take this as an act of war just like no one takes cyber attacks as an act of war.