Who Are We To Judge?

I know this deviates from the fictional aspect that I tend to represent, but as it's a presently dramatic and widespread issue that I've been seeing all over the place...I've been inspired.

He Killed 20 Kids And 7 Adults -__-
1 Like = 90 Punches
1 Share = He Dies In Hell

I found this picture posted by a friend on my facebook newsfeed. In all honesty, I came surprisingly close to tears. The tears that I came close to shedding were not, however, due to the thought of what this person did.
The incident itself is terrible. It's beyond terrible, I don't have enough words in my vocabulary to give it an adequate description. It hurts to think that this is the reality we live in. It hurts to realize that this is how the world is.
Another person commented on this subject by stating that "the world is getting ugly". Debatable. "Getting" is not the correct term for this present day. The world is ugly, and it may not even be the world that is ugly but the hearts of the people who are in it. The world has been filled with hideous acts of the same calibre for thousands of years. Heinous crimes of the same genre have been occurring since long, long ago.
That is not the idea that got me writing about this. It is the caption beneath the picture above that my mind is agonizing over now. The families that have been shaken and broken and put into excruciating pain because of this may no doubt be thinking along the same lines. Some will think that punches and rotting in Hell are not even suitable punishment for what has been done.
Violence is the number one response. Understandably so. Why shouldn't this person pay for killing with death? Why shouldn't he suffer just as everyone under the destruction that has been done is suffering? We don't even know why he did what he did. He has acted out his deed and paid with his life already, before any explanation could be obtained.
But what will further violence and ill-will bring anyone? What good does it do for all of us, who are only touched by the news of this tragedy and not by tragedy itself, to continually curse this person? Does it bring any form of lasting satisfaction? There must be another way to deal with the news. There must be another way to respond to this. It saddens me to think that millions of people out there wish death and Hell upon this person even with the knowledge that this person may have passed on without realizing just how terrible his crimes are. Now that he's gone he does not even have the chance to change. Whether he deserves that chance or not is not up to me to decide.
For who are we to judge? I am not a victim here. I do not know what it is to be a victim of this kind of atrocity. I have no idea. Anyone naive enough to assume that they can imagine this pain without first experiencing it is thoroughly deceived.
Even so. Do we have the right to condemn this person to Hell itself? Do we have the right to decide what his fate should be based solely on what he did. What about why he did it? Our decisions are not valid when we don't have the reasons and the facts behind things. What further mistakes are we, as humans, going to continue to make simply because we judge at the conjuring of our thoughts? What more are we all going to destroy because we fight fire with fire, violence with violence, and do not resolve the wrong within ourselves before turning to correct the wrong within others? We can judge and condemn others all we want because of what we believe. That does not make our judgement right. There is so much we do not know. There is so much we can't know or even hope to understand. Can we still curse and condemn anyone who defies our beliefs of right and wrong when there is so much we do not know? Can we still offer them the punishment due to them if we do not even know what punishment we ourselves, as individuals, may deserve?
Why are we cursing with the world when we should be mourning with the families?