Open message to the perpetrators: I don't know who you are or what your cause might be or what you think your justifications for your act of horrific violence might have been. I don't care. Nobody cares. You will never win because there are more good people than there are of you.
Want some evidence? Watch the videos and see how many people run toward the explosions, to help the wounded.
One thing I do know: There is a special place in Hell waiting for you. You are a monster.