Perhaps he was depicting the plight of Iran then, not his personal angst.
Artists have always chronicled their times, he could not very well ignore the sadness, horror and futility of it all.

You are right, of course.
But, some, like this one (The Empty People, 1976) - four years before the war started - does show a depth of despair (IMHO):
http://www.persia.org/Images/Katouzian_art/empty_people.gif
And, this one - two years after the war (The Forgotten - 1990) seems to show a hollow, empty lonliness:
http://www.persia.org/Images/Katouzian_art/forgotten.gif
Funny that we see nothing painted by him since 1990.......