The reporter did the equivalent of noticing a lock was rusted through and barely hanging on. He poked the lock and it crumbled to pieces. He didn't take anything, he reported the problem to the government and later to the public. He didn't take the personal data just because his eyes saw it in passing.
If the reporter compiled a database of every teachers personal information, that's another thing. That's not what happened, the reporter looked at 3 teachers to establish the pattern and then reported it.