[Boromir88]

...but as davem suggested in his Fantasy thread, maybe seeing some of the gore involved in battle, and some of the fallout, would make these images of slaughter somehow more important.~Lal

And he certainly had a penchant for glorifying battles too, with swords shining in the morning sun, banners flying high and men dying almost happily on the battlefield, praised ever after in song and verse.~skip

And it's interesting that the one time we really experience the pain of war (on the baddies side) is Sam's first encounter, of war, with the dead Haradrim soldier:

It was Sam's first view of a battle of Men against Men, and he did not like it much. He was glad that he could not see the dead face. He wondered what the man's name was and where he came from; and if he was really evil of heart, or what lies or threats had led him on the long march from his home; and if he would not really rather have stayed there in peace - ...~Of Herbs and Stewed Rabbit

Before this, Mablung and Damrod were "cursing" the Southrons, for joining with Sauron. Sam steps in as much like an independent narrator, who just got his first look of "Men against Men."

Perhaps also part of the glorifying is because of the value both the Men of Gondor and Rohan place on battle:

"...For as the Rohirrim do, we now love war and valour as things good in themselves, both a sport and an end; and though we still hold that a warrior should have more skills and knowledge than only the craft of weapons and slaying, we esteem a warrior, nonetheless, above men of other crafts. Such is the need of our days. So even was my brother, Boromir: a man of prowess, and for that he was accounted the best man in Gondor..."~The Window on the West