If you aren't ready yet, then get ready for a continuing stream of this kind of stuff.  I'd suggest reading a few anti-war books about what intense combat can do to your head.  
I'm not at all surprised that this guy - or any other soldier returning from Iraq - could flip out.  I imagine that a GI returning from a 1-year deployment in Iraq, having experienced mostly mid-level-intensity combat, would need at least 3 years to come down to a 'safe' level.  That's three years of tapered 're-integration' with society.  That must be a nightmare trying to come 'home'.  Just the notion that 'home' is that place you left before your war experiences...ridiculous.
I hope someone does a documentary on what the scene is actually like in Iraq.  I can hardly imagine how awful and brutal and disgusting some of the scenes would be.  Maybe there already exists good documentaries of such conflicts...will research...