In most acts of extortion from hijacking to armed robbery, the story is the same -- they don't "intend to kill anyone". But when you have a bomb, a gun or some other lethal weapon that you are using as a threat to get what you want, often people die as a result. That's not just "a tragedy", it's a murder. Intent may influence what degree of of murder it is -- 1st degree, 2nd degree or manslaughter. But it's not "self-defense" or "accidental death". It's murder, and in this case, it was the murder of a police officer.
Take it up with the judge then.