Motive? What is the crime?
Obvious plan to do mass murder.
Seriously
I hesitate to call into question your intuitive processes, but given the recent histories of murderous nutcases killing the unarmed and innocent, why in all that's holy are you questioning this arrest?
Simple logic dictates that there no possible innocent reasons for smuggling a shotgun, a short AR, and four pistols - all loaded with rounds in the chambers - into a bathroom of a grocery store.
What outcome would have preferred?
I know right? When a grown man can’t smuggle firearms into a grocery store bathroom and then load the firearms in the stall then THE TERRORISTS HAVE WON!
clown