Yeah, by such definitions any country is justified to wage a war and always find a way to claim it’s for self-defense (which is indeed how most causus belli have worked throughout the history – they always claim to have the moral high ground when launching the war). This is also how essentially in every country it’s called the Department of Defense (unless you’re Trump) but that means nothing as they start wars all the same. Not a trace of any rules, accountability or restraints still remains under such a framing.