What is the cost, we had paid when we're in war

Everything have a cost or impact on our life. If I'm talking about technology, climate, peace etc.
                Newton third law
                            "Every action and reaction have equal in magnitude, but in opposite direction."
             let's suppose a two people start fight each other
             1. first hit by second guy [$20]
             2. abusive language [$200]
             3. lose [$100 -]
             4. trust [$1000]
if we sum them , then roughly we get $1320 simple. What happen we two groups fight
roughly =  $10,000. Two countries will fight them, roughly $100 - 1000 billion dollar.

If i calculate the profit which we get after a fight we simply say that
             fight cost 1320 
                      profit 0   [high probability= 80%, chance = 1 died]
                      cost 10,000
                      profit 0 [max chances = both died]
                      cost 100 - 1000 billion
                       profit 0 [max chances = 100 of 1000 died ]
after war what we get, nothing , dusk, ashes. It's better we, continue our mission instead of take part in war.

                    Remember 9 August 1945, 1941, 1965,1971, 1972-2019