I can see that in some cases, it might be reasonable to carry items off the plane with you. (If overhead bins have opened and deposited items in your lap or the aisle, taking them with you as you exit may be the fastest way to get them out of the way - even if they are not your bags.) I can even understand the instinct to take a bag that's with you under the seat. However - photos seem to suggest at least a few coming off this plane lugging all their luggage.
