I am fairly certain that each dollar that has been in existence for more than a couple of years, has passed through the hands of at least 10 criminals.
That is quite different than "10% of the money supply in the world is in the hands of common criminals".
You keep repeating this speculation as if it were true, merely b/c it is possible. Yes, it is possible that 10% of bitcoins are in the hands of criminals. However, under the scenario that you paint, it is highly unlikely. Why would criminals want to hoard bitcoins? They may clean them first before hoarding them, but likely they would cash out of some of them, if it were true that "criminals" were holding 10% of bitcoins.
Also, you are NOT even clear with your definition, exactly, what is a criminal. I am gathering that you are defining a criminal as someone who has taken someone else's bitcoin.
If it is a small group of people, then is their plot to hold bitcoin in order to sabotage bitcoin in one way or another. I doubt it. Usually, thieves are NOT that ideological nor that sophisticated. Usually, thieves are inclined to steal in order to reap the benefits of the theft (and accordingly to cash out). Since dollars are more liquid than bitcoins, it is likely that a lot of these 10%, if they were to exist, are in dollars, and NOT in bitcoins... .. so, therefore, your theory about 10% of bitcoins being in the hands of thieves is NOT only highly unlikely but also highly implausible in terms of its speculative value.
