However, someone who srunkenly fires a bullet at someone with whom they are angry, fully intends to cause that person harm.
It isn't murder if you don't intend harm.
By that logic, I can just drive my vehicle around at any speed I wish, driving all over the road like a total crazy - and if I accidentally kill someone, It's not that big of a deal?
Let's say I decide to play chicken on the old highway with some old lady who really ticked me off with her driving. I'm planning to swerve at the last minute, but the old lady gets spooked and runs off the road and crashes into a culvert - killing her. That's MURDER - regardless of if my "intent" was to harm her. Is that ok too? Shucks, I didn't mean to hurt her....
I don't think so. A drunk driver DOES KNOW that EVERY TIME he/she takes to the wheel under the influence, they are risking their life and the life of others (we all take such responsibility while behind the wheel, but when we willingly put ourselves in a position to be FAR more dangerous, it's a CHOICE).