The problem is, you get the weapons in order to acquire the food (i.e., land, water). Hunger—>war just as much as war—>hunger. I daresay that most countries on earth can’t feed themselves. We could, but we’d have to skip the kiwi fruit.
I disagree. You have weapons to PROTECT that which you have.
If you think you can just march in and take what you want because you have a pistol, it could be a tragic mistake if your "victim" has a defend-able position, training, and superior firepower.
In fact it would be your last mistake.