who now understands that the normal sensitivity of a good human is mortally wounded by surviving war's evil.
However, the original War Horse was a child's book, and many scenes in the movie are a bit hyperbolic, allowing the movie to remain at the fantasy level of a young reader. Good!
it is a great responsibility to make the Choices for those with no choice, or whose choice has been taken away. i.e., When men decide to put horses into a war, they either basely assume that horses are property with little meaning, or they make the grave decision to accept responsibility for the lives and deaths of sentient creatures, consequenses of such a decision.
Some horses from Manhattan here: