1) at this time, there is no evidence Holmes is mentally ill. To the contrary, he planned this in a very sane way. Simply because he acted in a way that showed reckless regard for human life does not mean he is, de facto, mentally ill; and
2) yes, violence is common all over the world. But if you think the level of violence that is seen today is comparable to what was seen in this Country 200 years ago -- or even 100 years ago -- you are burying your head in the sand. What we are witnessing is a downfall of civilization that is characterized by cold heartedness, egotism, hatred, greed and many other negative character flaws. The cause of this can be debated. But to act as if the problem does not exist is simply foolish.