Will we forgive???

I saw this picture not to long ago and it brought the question to my mind. If we are not forgetting then how can we be forgiving  the person who did this. Now I am not saying to let them run free on the street but there is still a level of forgiveness and I think we as a nation have forgotten that. There are alot of bad things that came out of this there was needless blood shed but there was also some good done as well such as security procautions (yes sometimes we may get annoyed at them but they are truly there to protect us)!!! Just a thought!