Ark... I don't think anyone was offended (well, I for one was not)... the truth is the truth, and I'm generally not offended by someone bringing-up the truth, as gritty and sad as it may be.
War in and of itself is not pleasant or wonderful... the Civ games, for all their fun, do indeed represent a nasty reality of the human condition... war.
However, there are some "norms", which we as humans usually accept (and in some cases embrace) in the "honor" of war, or the "art of war"... however, we tend not to focus on the most tasteless aspects of war.
Grown Nazi soldiers (even with swastikas) fighting and dying on the field of battle is usually accepted in a game... however, you're generally not going to see a lot of mods with concentration camp crematoriums... that's just an aspect folks don't really care to focus on or recreate because it's distatefull to many (to say the least). That cruel fact may be true history in all it's grit, but folks probably don't want to repeat that in a game (true or not), which for all it's ups and downs, the game eventually is for the purpose of fun and entertainment... I think few people would consider concentration camps anywhere close to fun to think about.
I'd say children soldiers falls into the same group of things most folks would generally not like to see recreated. Yes it's true... yes it happens... yes, it's part of the human experience... but it's generally not something folks want to "have fun with" in a game.
Was I offended? No...
Am I upset with you for bringing it up? Not in the least...
Do I want it recreated in MY game? Nope... not me.
Make your mod if you want... I just wouldn't be surprised if that aspect is advertised you'll get a lot of downloads... but then again I could be wrong... do what you want to do... reality is reality... for me, that aspect of the human condition just isn't even remotely entertaining.
War is war... but even in war there are some lines that just shouldn't be crossed.