The SWAT team raids I've seen lozok prettt traumatic, I wouldn't blame the guy for grabbing a gun. Even if they did announce themselves, it could have been lost in the confusion. Still, they were perfectly justified in shooting the guy for being armed. I'd say no one at the scene is to blame, it's more of a conflicting issue that the SWAT team needs the element of surprise and how possibly innocent people react to that.