Consider the sources here.
Blackwater is not part of the Great Conspiracy. It's a private security firm, and in Iraq, it is subject to a much more violent environment than is normally seen. Incidents are common. In this case, they were repelling an attack. Most of us are waiting for results of an investigation.
Go out to the news lines, do some research. Get a broader view. Most people have no idea what actually happened in the incident.
The Left is jumping on this eagerly. If private security can be crippled in Iraq, it will put more of a burden on our regular troops, and make their defeat more likely.