You'll notice in the blog that the author has problems with quite a handful of people. I know someone who has written similar reports of just how unfair and mean several other people are.
The truth is that he is the loony-tune. Every interaction with this person is fraught with the possibility of being accused of something, up to and including assault.
Whatever one might believe about Grisham, the actions of the police were unwarranted. A man bearing arms who is otherwise seen to be law-abiding should be left alone. If he is questioned, he should not be disarmed by force. If he must be disarmed, then he should be informed of the necessity and given every opportunity to disarm himself.
That. You got it.
I came away with much the same impression, just short of thinking Yon is a looney tune. “He doth protest too much” leaps to mind while reading his screed like a blaze orange cow in a field of grass.