This kid is a millionaire in the making. All of his conduct was legal.
Intent has to be proven- as you state, so far none of his individual actions violate state law.
If this was true, then the three individual guys open carrying carrying at another central MO Wal-Mart today ought to be in the hoosegow too? One of them was really scary looking to me... ( as I slunk along with my concealed 1911 and concealed armor in the next aisle).
His conduct may have been legal, but it was definitely stupid.
Like you, though, wondering what actual laws he violated.