It may be a violent person but the image alone is not violent at all. So stay calm, everything is OK

If you brain wash children with images like this day by day, many years, most of them will become people like this, violently and that's nothing good at all!
It will be more ok if you edit your post and delete the image attached.
If they know who that is and reveal it, that person might become a target. They'd also be responsible for a large panic on the market because what if that's someone's neighbor? What if he lived in a country that your country is in conflict with? What if you knew him? It would be a spark that starts a fire.
If they don't know or are unable to track him, this would make people see them as incompetent. It would decrease the respect for the institution. Why tell people you're unable to do something, especially after the recent fiasco of the Secret Service?
People who knew Satoshi Nakamoto in person possibly is very little than total fingers in one or two hands. I don't know whether there are people who actually knew Satoshi Nakamoto's identity but if they knew it and kept their mouth closed for more than 15 years, there will be nearly no reason for them to open their mouths and reveal identity of Satoshi Nakamoto.
Is this the first bitcointalk.org topic?
What happened with topic 1,2,3 and 4?
1, 2, and 4 exist in the staff forum. 3 was permanently deleted at some point (it must have contained Satoshi's real name and address).