To "end war" would take a dynamic shift in human perception and behavior — something you propose possible by "getting enough people together".

Not happening while the military industrail complex and their merchandising department, the mass media, are constantly pulling people into the "reasons" for these wars.

---------

I add this to the Smedly Butler ideas.

Ten Commandments of Propaganda — 1928 by Arthur Ponsonby / Anne Morelli

1. We don’t want war, we are only defending ourselves.

2. Our adversary is solely responsible for this war.

3. Our adversary’s leader is inherently evil and resembles the devil.

4. We are defending a noble cause, not our particular interests.

5. The enemy is purposefully committing atrocities; if we are making mistakes this happens without intention.

6. The enemy makes use of illegal weapons.

7. We suffer few losses, the enemy’s losses are considerable.

8. Recognized intellectuals and artists support our cause.

9. Our cause is sacred.

10. Whoever cases doubt on our propaganda helps the enemy and is a traitor.

Now look at the coverage of the war in Ukraine in the NYTimes.

------------

My approach starts at hopelessness.

Here is one last thought.

"The Italian philosopher Giorgio Agamben said in an interview that 'thought is the courage of hopelessness' ─ an insight that is especially pertinent for our historical moment, when even the most pessimistic diagnosis as a rule finishes with an uplifting hint at some version of the proverbial light at the end of the tunnel. The true courage is not to imagine an alternative, but to accept the consequences of the fact that there is no clearly discernible alternative: the dream of an alternative is a sign of theoretical cowardice; it functions as a fetish that prevents us thinking through to the end the deadlock of our predicament. In short, the true courage is to admit that the light at the end of the tunnel is most likely the headlights of another train approaching us from the opposite direction." — Slavoj Žižek