Violence has erupted at Fort Hood yet again.

It’s early in the aftermath of the latest shooting rampage at the sprawling Army post in Central Texas.

Four people — including the gunman — are dead and many others are injured.

It was less than five years ago that Army Major Nadal Hasan opened fire on his fellow soldiers while protesting the Pentagon’s war policies in Afghanistan. Hasan, a psychiatrist and a devout Muslim, had been ordered to Afghanistan; he wouldn’t go, so he embarked on a senseless rampage. An Army court martial convicted him and sentenced him to death.

Now this event.

The nation’s heart breaks once again at this senseless shooting. President Obama vows to get to the bottom of what transpired. Joint Chiefs Chairman Martin Dempsey said the Pentagon’s main focus right now is to support the families of those who were killed or wounded.

Meanwhile, the simplest of questions arises from this tragic act. Why?