Ah, I think I misunderstood you. Apologies.
I am aware that all war has some point, to someone. I was commenting on the fact that often times the point is pointless. For example: the forcing of religion on others is a point that many believe in, but I find to be disgusting.
Similarly, you don't have to fight in a war to have something worth fighting for. There have been many peaceful protests throughout the years (Ghandi? MLK Jr. anyone?) and I would never say that those people were miserable for avoiding violence.
Also, those who fight in wars are brave people, no matter what side they are fighting on. Whether or not I agree with their reasons for fighting I admire their courageousness and dedication.
Now, of course, in the Animorphs fight there was no choice but to go to war. The war came to them, and it was a cause that the Yeerks believed in heartily. I do think that the way that Jake came out of it sucked, and the ending itself was rather disheartening, but quite often war is disheartening (like in Iraq...we didn't actually find any WMD's, which lead quite a few people to question the war itself). Still, the ending of Animorphs, while not ideal, did lead to a win.
I think I may have disliked the ending even more if it left off with them slapping a high-five and strolling away. Jake had to suffer like he did. After he went through all of that? I don't think that there was anything else for him...