A jail sentence would, IMO, be entirely appropriate for doing something other than concentrating when operating 1.5 tonnes of lethal machinery.
I believe that anyone doing anything else which had such inherent dangers would be jailed immediately if they decided to do something other than concentrating which took the life of an innocent third party.
The important thing for me is that it was the driver's choice to do something else, it wasn't a distraction, it wasn't (IMO) a lapse in concentration, it was a conscious decision to play with the heater controls rather than drive.
It must be great to be the perfect driver. Never distracted by anything even for a few seconds.Constantly 100 % alert.Never tired .
Unfortunately that driver doesnt exist. I have been driving for over 30 years without hurting anyone but accept I am only an average driver and a certain amount of good luck has got me to where I am now.
How many of those who think this guy should be imprisoned can put their hands on their hearts and say they have never once made even a tiny mistake or had a momentary lack of concentration on the road ,if you dont drive then same question applies to when your cycling.
If I had a lapse in concentration (which this wasn't, it was a decision to avert his attention) which resulted in the death of a third party, then I don't think I would try to appease my own conscience with a "shoot happens" clause.
Fortunately, most people check there is little danger before they decide to change their focus.
Bottom line, for me, is that the driver decided to do something other than focus on the road and, as a direct result of that decision, someone died. That should be manslaughter, at the very least.
Jail would be a significant deterrent to the driver in this case, and would start to sent out a message that those who operate lethal weapons should operate them appropriately and not consider them to be an extension of their sitting rooms.