Eight of those killed were Mexican, also 9 or 10 wounded. He apperently stopped into Walmart to get a bite to eat. Then decided it was crowded enough to meet his criteria, went back to his car and came back in armed and shooting.
That really shows very little planning and fore thought. Just load up with gear and drive west for a day ? Get hungry and check out a Walmart. There has to be dozens more like him. Maybe hundreds. This is what a crooked, vile and evil government has wroght.