This not the first time Mike is taking up the same rhyme:

Freezing BitCoin addresses by regulating miners
April 17, 2011
by Mike Hearn
https://bitcointalk.org/index.php?topic=5979.0

There is some hidden agenda, isn't it?

More on the same topic:

What if bitcoins that can be tracked back to Silk Road are declared 'illegal'?
June 22, 2011
https://bitcointalk.org/index.php?topic=20979.0

Governments/regulators may eventually actually *like* Bitcoin. - coin blacklists
December 02, 2011
https://bitcointalk.org/index.php?topic=53539.0;all


EDIT:
My opinion: Bitcoin (as public ledger) is information. 'Tainted'/blacklisted/whitelisted coins are censorship in the purest form. When has censorship served for the good of humankind?