Still would have done it, all you are doing is making a point of law and not looking at the emotions. Do you really think a parent would be bothered after losing 2 children needlessly. The age makes a big difference, so what would he serve 6/8 years and still be a young man and maybe go on and make something of himself. No kill him that's the end of it, not be told in years to come while you are still grieving that he is doing very well for himself.
I understand the emotions entirely, but I still don't think that makes the killing just. In the post you replied to I was talking how I'd feel from my point of view and I totally agree that any parent, including myself, would be furious at the man for taking the lives of my children. Drunk or not, I doubt this man was a cold-blooded killer who would have callously shrugged off the deaths of the boys. Doing well for himself? I doubt it, what with a criminal record and the constant guilt for what he had done. And in any case, does this driver really deserve a death sentence for this mistake? I believe we are diametrically opposed in the sense that you think that revenge killing is okay and I disagree, I think we should just agree to disagree as we are going in circles!