I certainly agree with your very valid point about intent and perhaps the law has gone too OTT with its wording.
You hire me to kill someone that is annoying you and I wait until I see them crossing a road. I mow them down and then explain to the reporting officer that I had a momentary sneezing fit and only saw this person at the very last minute. It was a complete accident and if only they had looked this terrible accident would have been avoided.
I agree with your point about intent but it is an open door for everyone to drive a horse and cart through.
Just thinking for a sec.... I can recall a foreign lorry driver watching his TV whilst driving his fully laden truck. He overtook a driver who gave evidence saying how he saw this person watching the TV when he drove by the car and shortly after this the truck ploughed straight into the back of a stationary vehicle. This truck driver got away with killing the occupants because it could not be proved he was watching the TV even though our laws are quite clear about the siting of monitors, TV etc.
If you want to kill someone then use a car
John