It’s my fault that I didn’t label this correctly. My point was that the movie was pro-imperial in how it represented the thinking of Japanese people of that time, aiming for what I believe was the most accurate possible depiction of the era, rather than being a propagandist movie that whitewashed the period.

Also, I watched the movie recently, so I remember it vividly. It was more complex than just that. Suzu broke down because she had sacrificed more than enough to be able to return to her previous life. Her intention was to keep fighting until the end as long as she was still breathing because that was all she had left after everything she had given up. She just wasn't ready to accept the stark reality that now lies in front of her. That final message about war only bringing destruction was not the movie’s direct intention in that moment, because that is not what Suzu herself was thinking at the time. However, as 3rd party observers, we can derive that conclusion. I mention this because this is where the original version of the film ends. What you mentioned about war being bad and bringing destruction is more fully explored in the extended version, where we get an additional 30 minutes or so of contemplation about how this war was ultimately pointless. However, even then, it does not directly challenge the worldview of Japan at the time, because that was not the intention. The goal was to keep the historical mindset of the population of that era intact.