Why does it take a tragedy like this to get people to HUG each other!?!!

I didn't see anyone turning people away because of their religious beliefs, sexual lifestyle, color, nationality, or level of intellectual ability. I didn't see anyone saying "No thanks, I'm already saved" - or we don't need to search those cars in the river because they're different from us.
I'm sorry. This makes me angry because I can't slap whoever is responsible for this terrifying act - or pick up a gun to avenge the deaths of those people lost. It would only create more terror.