Th War measures act was invoked by Canada only twice in this country's 150 year history that I know.
Once against a people who country of origin, not race, we were at war with. Remember we were allied to the Chinese at the time so you can't play the race card. It was harsh, but was an easy solution to a difficult question. Not necessarily the right solution, but the easiest. I was more concern with the government(s) respond after the war that ticked me off. It not uncommon error, but it's more important what you do after the error is discovered and the government(s) response sucked for a very long time.
The second time was when terrorist in the early 70's, who all looked like you and I, were blowing up the city of Montreal on a regular basis and kidnapping politicians.
To lesser degree, we were at war with a foe that was not not so obvious and therefore the WMA was invoked on our own. I've not met many people. French, English, Italian, or Oriental, in Quebec who looked at that application of the WMA as a bad move. it may have given the later some flashbacks but they were very astute in their overview of the events.
I'm glad you've been very fortunate not to have to use force on a regular basis, neither have I, but their many people with whom that 's the only thing they respond to. That was my point. when dealing with them you have have the message or reputation of being willing and skill to back up your words with force. How many police officers go through their entire service never having to fire their gun once on the street. Even today, most are in that group but we all know they can and will if called to. That makes their job easier. I'm the first to look,with great respect, at the French and British police with their skill to operate in their environment without the individual use of firearms, and admire them. The same can be said of our Newfoundland Constabulary, but they are considering a change there.
As to your comment and question on peacekeeping, yes peacekeeping is a government word, but it but it describes the the job very well, just as police work can be described as peacekeeping first and law enforcement second.
As to what our taking firearms on patrol in foreign lands is called, it would depend on what the mandate set by our government says it is; war, peacemaking, peacekeeping or embassy duty (which in the true sense is not foreign land, but that's spitting hairs).
If your original argument was the morality of the golden rule (do onto others ....), which in it's basic form is a part of over 10 major religions, then you may have point but the idea of theft as a moral question is something I've not read or discussed anywhere.
Theft is theft. Did you own it? Did you take it? Did you have permission? Then it's theft. With respect to taxes; They do have permission to take it, therefore it's not theft.
As to the question , is the bible a book of legal terms written by a state? My short answer is no. If your answer is yes, what state?