Re: If MtGox can ident the Bitcoins, why not fix it?

Back to the missing Bitcoins and the original question. Identify the Bitcoins and stop them in their tracks. Whether double spent or stolen, mine are mine and if MtGox sent them to someone else that's theft.

You're not a newbie based on the post count... you should know by now that what you suggest is impossible. Even if it was possible, it would not be fair: The "illegal" bitcoins may have been part of hundreds of transactions after leaving Gox. Those transactions may be totally normal trades between people who had no idea that you would later declare their money illegal. Who are you to say those trades are now void?

Who am I? the rightful owner of those Bitcoins.

Sadly you are not. If you don't have the private key for "your" bitcoins then you have no bitcoins. What you do have is an IOU from MtGox to repay you x BTC at such time when you choose to withdraw them. You own debt from MtGox. MtGox has failed to honor that debt. That is the problem with debt. It is often not repaid. The advantage of Bitcoin is that it has no counterparty risk however if you hand over your Bitcoins in exchange for IOUs then you are giving up that advantage.

If you don't have the private key for "your" bitcoins then you have no bitcoins.

As for saying you are the rightful owner. Says who? Based on what evidence? Who judges that evidence? How do they have the master control key for the Bitcoin network?

Then back to the missing bitcoins. When the US government seized some MtGox bitcoins because laws were broken was there a verifiable blockchain trail identifying specific bitcoins with specific lawbreakers?