Well, from memory, an arbitrary search and a vague 4am laziness, here's a few exceptions to that rule of yours.
Sodom and Gomorrah were acts of genocide. Pretty sure there would have been young children in a pair of big cities somewhere, so killing everyone seems unjustified to me really. Bit genocidal, even.
NOAH'S FLOOD, for goodness' sakes. Noah's flood, had it actually happened at all, would be classed as the biggest genocide in history on account of killing very nearly every form of life on the planet. Kids and all.
Deuteronomy 2:33-36:
The "men, women and little ones of every city" sounds like a genocide to me, good sir.
1 Samuel 15:2-3:
God orders the genocide, men, women, children (plus "infants and sucklings" and donkeys this time) and all, of the Amalekites based on what Amalek did hundreds of years ago. That's not justified, sir.
And if you're trying to tell me that a particularly young child is not innocent enough to avoid Mr. Fictional's latest genocidal rampage, then please remove your head from your sin-obsessed behind and listen to what you're saying.
@Andreas:
The site is a repository of human insanity. It doesn't have to be about debate or discussion all the time; some things just need to be ridiculed for what they are. Generally, what they are is blatantly wrong (like this one), frighteningly short-sighted, inconspicuously bigoted or violently immoral.
As for the fun factor, it's kind of like watching an awful movie (let's say Plan 9 From Outer Space) and then talking about it afterwards. It's indisputable that it's awful, but exactly how awful? What exactly was wrong with it? Which particular scenes were badly done, and what was bad about them? It can be fun simply to talk about what exactly is wrong with stuff that is obviously just blatant idiocy.
And as for the comments 'directed at' the author, I suppose that's relatively abstract. It's a habit gleamed from common internet use, presumably.
Additionally, as has probably already been mentioned, it's been scientifically proven that arguing with a creationist is akin to arguing with a dead weasel. "God did it" is not an argument.