Oh You Can Try, But It Would Be A Poor Argument At Best

If there were no weapons, as in objects created with the purpose to harm another, there would still be conflict, just a whole lot less damage.

Is it impossible.... Good to always challenge our assumptions. That said even if it were impossible it shows us something about weapons and the destruction they do.

What do all those places have in common?

Totalitarianism

And mass gun control.

Sure totalitarian regimes may try to disarm the public, but gun control is not exclusive of dictatorial a governments. That said this meme is an exercise in which one imagines all weapons being gone... This includes that of government’s and other potential groups.

Most totalitarian regimes will often disarm the public in the first year of it's reign, but when you said "gun control is not exclusive of dictatorial a governments." that still holds true. When you said "That said this meme is an exercise in which one imagines all weapons being gone... This includes that of government’s and other potential groups." that can't work because weapons have been around forever, so it would be impossible to have a society with no usage of weapons.

First you have to sincerely do the exercise to have its intended effect.

Weapons are even in nature it's self, so it would be a exercise contradicting universal law.