That's different from a lone gunman. There is no evidence that Cho had the support of any nation to commit that act, so it was not as if he were authorized to do it. In a war, it's a totally different context, because warriors are sacrificing themselves to protect their country. They are sacirificing to protect their family, their God, their society.
I'm not sure what Cho was trying to accomplish. it seems he was alone, and had no support, and his ramblings as they were presented in the news don't make much sense. I'm sure in his reality it made sense to him. I don't think it makes sense to any of us.
I've done the same thing with the red. Emotive reasoning. Now inclusive of judgement outside the grip of reality. Irrational.
The rational approach to disagreement is negotiation. War in and of itself is emotive (driven by anger mainly)...irrational. Bear in mind that emotive reasoning may have some benefit sometimes...but by definition it is irrational.
The rational approach to individual oppression is psychiatric care, support of family, friends...stress relief activities, self improvement activities. NOT shooting people that may or may not even know you!
Like I said to peta9, the poll result is extremely disturbing, almost as much as the incident.