I disagree.

You can wait until all the facts are in, but you might be waiting forever. Some facts will probably be classified and some facts will never be disclosed.

Meanwhile, while you are waiting for all the facts, the news media is busily creating the dominant spin. Public opinion is being shaped, while you wait forever.

There is plenty of evidence to contradict the prevailing media meme (He was a madman.) Hasan actions were motivated, at least in part, by religious/political beliefs.

By your measure, Timothy McVeigh was not delusional either:

I chose to bomb a federal building because such an action served more purposes than other options. Foremost, the bombing was a retaliatory strike; a counter attack, for the cumulative raids (and subsequent violence and damage) that federal agents had participated in over the preceding years (including, but not limited to, Waco.) From the formation of such units as the FBI's "Hostage Rescue" and other assault teams amongst federal agencies during the '80's; culminating in the Waco incident, federal actions grew increasingly militaristic and violent, to the point where at Waco, our government - like the Chinese - was deploying tanks against its own citizens.
Knowledge of these multiple and ever-more aggressive raids across the country constituted an identifiable pattern of conduct within and by the federal government and amongst its various agencies. For all intents and purposes, federal agents had become "soldiers" (using military training, tactics, techniques, equipment, language, dress, organization, and mindset) and they were escalating their behavior. Therefore, this bombing was also meant as a pre-emptive (or pro-active) strike against these forces and their command and control centers within the federal building. When an aggressor force continually launches attacks from a particular base of operation, it is sound military strategy to take the fight to the enemy.
Additionally, borrowing a page from U.S. foreign policy, I decided to send a message to a government that was becoming increasingly hostile, by bombing a government building and the government employees within that building who represent that government. Bombing the Murrah Federal Building was morally and strategically equivalent to the U.S. hitting a government building in Serbia, Iraq, or other nations. Based on observations of the policies of my own government, I viewed this action as an acceptable option. From this perspective, what occurred in Oklahoma City was no different than what Americans rain on the heads of others all the time, and subsequently, my mindset was and is one of the clinical detachment. (the bombing of the Murrah building was not personal , no more than when Air Force, Army, Navy, or Marine personnel bomb or launch cruise missiles against government installations and their personnel.)