Trowa was on Earth, at this age, and couldn't really comprehend a life that didn't involve war.

However: in a few years, Quatre will learn that Trowa is nearly impossible to offend with bad manners! So he just nods in matter-of-fact comprehension.

"Sometimes Earth people think that about the colonies too."

"It's stupid. But sometimes people find it easier to be ill-informed."

Trowa has Standards.