I would like to share my thoughts on the subject for what it's worth.
It's sad that apparently it sometimes takes the murder of innocent people to actually acknowledge just how awful human nature can be. History shows that there have been horrible people throughout the world, and they are always the ones who end up getting the attention. It's not as interesting to show the nice man who held the door at the bank for an elderly woman than it is to show the man who robbed that bank and killed the teller.
But, as it should be, bad sadly isn't, apparent to all, strife, chaos, and injustice is the norm. Not goodness, kindness, and charity. We like to think of Hitler, Stalin, and Mao, who killed 100 million people between them, and think that most of us are not like that. But we forget that they had tens of millions of people who willingly, even eagerly followed them. Many of them supported, and even encouraged it.
Humanity is not by its nature good. People, guided by ethics and morals, can be indeed very kind, and accomplish great things. We can end suffering. We can free millions from the oppression of dictators. We can even end the slavery of millions. But that is not the norm.
Therefore, we must not remember the names of killers, but rather damn them. We must remember those who suffered the injustices or tragedies such as what happened on Friday. We must also raise people who do good, who follow the better angels of their nature to higher level, and give them the recognition they deserve.