I just finished reading the Sentinel piece, and it reads like the sentiments of a truly troubled man--the sort whose lost hope was supposed to be restored by moving to New Hampshire.
Though, if you read the whole thing, or far enough in, you will see that his conclusions are flawed. In multiple ways, it should be understood that he has only his education to blame. The NAP did not reach his soul in time. I expect the NH bureaucrats will leverage the violent sentiments in it to color the recognizable liberty talk as also violent, and extrapolate the fear of violence to all those who talk of liberty. It's fortunate that he chose to limit the violence to his own body, or they would have much more to go with. This is a time for measured speech, in Keene, NH, and everywhere.
Though his writing is far from perfect, it is mostly coherent, and helps the sane understand his desperate actions, somewhat. We are fortunate that this desperate individual left us more to digest than the typical rambling, however flawed.