Mass Murder - is it just the modern world?

I just read about a serial or perhaps spree killer in the Philippines who went on a rampage in the last month killing 9 people. They found him through his Facebook page. He was an educated and employed 28 year old computer tech. Yesterday, the news carried the arrest of a serial killer from the metro DC area, charged with the murder of two sets of mother/daughters and suspected of more. He is college educated and employed. The things that made these stand out are the foreignness of the first and the race of the second. Most [I read 85%] serial killers on record are white, middle class Americans. I'm wondering if we are just rubbing off on the rest of the world or if there is something else going on. I read one article which says it is a phenomena of urbanization and alienation. That would at least explain its increase over the last 100 years. It would be interesting to see if the spread of media is correlated with this phenomena, or is it that we just hear about it now, where once it was a local event. I had always assumed that civilization would lead to civilized people, but it seems to lead to the opposite. Or perhaps there are just so many more people in the world, that even a small percentage of deviates produce significant numbers of these killers. Nonetheless, it is depressing.