Certainly not bad...
...though, for having studied the shooting so in-depth, right down to the BMW, I figured you would have understood the motives of the two. Perhaps you were going for the mainstream view, in which they were bullied and constantly looked down upon by peers, or hell, in the Trenchcoat Mafia, simply so it applied to most people's view of the incident. Regardless of what you stated in the description:
Just to point it out--both Eric and Dylan were fairly popular students, and they had no targets. Yes, they made a list of the people they hated, but only one of them was injured. Eric was most likely the driving force, seeing how he is was a clinical psychopath. Dylan was simply the stereotypical depressed teen. The suicide note is a fake--in Eric's journal he explicitly states not to blame anyone for what they did: not his parents, not Doom (which he often played, and even made a few levels that are still running around), not the parents of other students--nobody. They were out for death and destruction, plain and simple.
In most respects this is an extremely good flash. I have some qualms with the fact they you consider it truly factual, but whatever, it's not all that important. Clean artwork, a good script going to the very heart of an extremely controversial incident yet not demeaning it whatsoever--overall, very compelling. Nice work.