> It's never going to be perfectly safe, but that's literally the point of being a soldier.

No, taking unnecessary risks to do things that aren't legally required for enemies in war is kind of the opposite of the point of being a soldier.

> If you don't want that tradeoff, then don't say an oath that requires you to put your life on the line defending the constitution

The Constitution doesn't require the government to take any special restraint in war when someone fighting on the other side is a US citizen.

There may be a good argument that the law ought to given the realities of modern war, sure. And that's a debate we should have.