Remember, with an IP address you can trace where the location is as well as what ever information the internet provider collects for providing services or servers to the user of this IP.
On a side note, I believe one day we may all have to " hard register" ourselves to an IP and possibly the government would require you to "register" all your BTC addresses with them tracking your every move -- as well as anyone else who would like to.
Remember, everything is public, our data is LIVING on the internet, and is currently hard to kill. Ever evolving and ever changing as computing resources grow. Kill technology and forwardness, and you kill Bitcoin.
Possibly we will use the sun to generate all our computer processing needs in the future and ever expanding internet universe.
Welcome.
for over a century fraudsters have been laundering bank notes. government has never requested people to write their zipcode and name on every bank note they touch.
same thing applies to bitcoins.