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So much for the "we can't know his motive" motif. It's all too similar to the responses of the 9-11 attacks when every talking head or pundit claimed that nobody could have predicted that aircraft would have been flown into the Twin Towers. Yet as many of us later learned there were enough red flags (Arabic men learning to fly) and previous incidents (the Algerians who wanted to crash into the Eiffel Tower...1994 and WTC/I happened in 1993) to raise concerns. Besides, there was no need to "predict" what might happen as the possibility had existed for over a decade...
(Between Early 1984 and October 1985): Office of Special Planning Studies Vulnerability of WTC to Terrorist Attack
However, O’Sullivan consults “one of the trade center’s original structural engineers, Les Robertson, on whether the towers would collapse because of a bomb or a collision with a slow-moving airplane.”
The plane was moving fast so nobody could have predicted that. /sarcasm

And now history seems to be repeating itself all over again with a very similar drumbeat. And as more information is discovered it seems that the drums are once again beating out some familiar tunes..."More of the Same" and "Believe Us, He's Crazy".
We can know his reasons and motivations and unless he is killed before he goes to trial all we, the American public, have to do is wait for the trial testimony to come out. (of course, that is based on getting a prosecuting attorney who is willing to get to the bottom of it all and not just brush it under the rug)

The media, pundits and government mouthpieces ought to remember that Americans know the difference between urine and rainfall running down their backs.