Outlaw war. It is challenging to know that there are people in power who act as if they are heartless.
It is my belief that most people are good, caring individuals. What I see as the problem are the propaganda machines. Every nation has them. We are all to some degree susceptible to their influence. What I believe this nation should do is cease and desist all actions that involve invasion of another country. We should bring our forces home and have a requirement that each person is responsible only for defending his/her own property. And that if someone aggresses against you, you have the right to defend yourself. I suspect that this would stop war once and for all to a great extent. I suspect that this would also encourage people to find other means to settle their differences than a resort to violence.