No, they can never go back to their "merry lives" again. What a flip thing to say. But they could have taken some solace in knowing that the killer was properly, proportionally, and definitively punished. And no, I don't believe anything that let him continue to draw breath is adequate punishment.
The father of the woman paralyzed and grandfather of her murdered children said this about the verdict yesterday:
"He's living, he's breathing, and our loved ones are gone for over three years now. And the gaping void, the gaping wound that we have with the loss of our granddaughter, has been replaced by a new abscess of him living."
And for that matter, I am an advocate of gun control and absolutely agree that the reason Holmes was able to hurt and kill so many was because he was able to buy weapons he had no business owning. It's an absurdity and an ongoing tragedy. So I don't fit neatly in the ideological box you tried to place me in. Regardless, the ability of almost anybody to buy needlessly powerful weapons is a separate issue from the killer's guilt and punishment.
There are a lot of smug, disinterested, and frankly inexperienced people in this thread who have never had to deal with loss or injustice on this scale. When you abstract things so heavily that you don't have to look at the specifics of the killer and the harm he did his victims, it's quite easy to be self-righteous and absolutist and make grand pronouncements about reason and barbarism. As ever, the truth and substance of the matter are more nuanced. The trial was fairly conducted but, again, I feel sorry for the victims who were denied the relief and compensation his death would have provided.