Who on earth are the 10% of people voting YABU?! Probably people who speed.
I haven't voted either way but find it interesting you immediately assume people saying YABU are people who speed, especially as there doesn't seem to be anything in this tragic story to suggest speed was the issue.
The driver was clearly not fit to be driving because of eyesight issues. His licence had been revoked because of that so yes, it was criminally irresponsible of him to continue. At the same time one can see how someone with no other way of earning his living might have been tempted to chance it. He is 65 so in another year would be state pension age and could presumably retire. Not trying to defend his decision, how could you, but can sort of imagine the circumstances which might lead someone to take that risk.
As to the sentence, well he has gone to jail. I think for most ordinary people that would be a big and shocking punishment, regardless of the length of the sentence. Of course it does nothing for the suffering of the family, but actually their hurt and loss will be the same whether he does 3 years or 30. The difference is just vengeance.
In summary, I think dangerously driving is taken seriously. But it is not the same as murder. Being criminally irresponsible is bad
But deliberately setting out to kill someone is worse