That bozo deserves punishment.
He made a deliberate attempt to instil fear into an innocent store-owner by doing something provocative and intimidating. He knew of the effect his action would have - that'd undoubtedly be the reason he did it in the first place - and went and did it anyway, without caring that an innocent party might suffer the fear of being robbed or murdered by a masked stranger.
Normal people don't wear ski masks into convenience stores; it's something done solely for conealment. At least, that's how it's widely interpreted. Every bank has a sign in its window stating that no helmets or masks may be worn on the premises, for that exact same reason.
