As others have said, this is a bad idea and an attack on the fungibility of Bitcoin.
This isn't just about politics. Bitcoin never was inherently fungible on a technical level. That much has always been true. I'm not sure it was designed to be fungible either but that is up for debate. The fact is that it was always possible to trace transactions and these ideas being presented would make it more possible.
The debate should be about the pros and cons of different solutions to a real problem. Extortion, scams, and corruption are real problems that we all have to deal with as a community. We can disagree on crime because not everyone agrees that Silk road should be illegal but there are some things that the community does agree on and has no tolerance for.
Scams for example which rob people of millions of dollars worth of Bitcoins. Trojans which hack peoples coins from their wallets. All these sorts of attacks hurt the Bitcoin economy and Bitcoin community as a whole.
So if you do not like Mike Hearns solution then you should offer a better solution which does a better job preserving privacy. Just trying to remove Mike Hearn from power isn't going to solve the real problems which he highlighted. If tainting coins isn't the solution to the problem then we need to come up with a more creative and free solution. A solution has to be presented by both sides of the debate though.
You cannot have one side which is pro extortion, pro hacking, pro corruption and expect that side to be taken seriously. So if both sides are actually against all that then both sides have to come up with solutions to protect the community from that. Mike Hearn has a point with Cryptolocker and no one is presenting solutions to dealing with it. If Bitcoins are worth $1,000,000 a coin then every single computer will be hacked for even a small amount of Bitcoins.
Mike is a smart guy, and has contributed numerous useful innovations to Bitcoin.
But he's still an idiot for advocating taintlists. These two facts are not mutually exclusive.
It hurts the value of Bitcoin, which is a currency with a free-floating value in relation to all other currencies, in case you didn't know. That relative value is impacted negatively by taintlists. That means your Bitcoins, along with everyone elses, cannot achieve as high a price. That means the purchasing power is hurt. We're not here for that.
Mike, being a smart guy, knows that there are technical solutions to theft, ransomware and user identity issues. He advocates each and every one of them. This makes his pursuit of eroding the monetary properties of Bitcoin all the more contradictory; what is the point in supporting the hardware wallet concept when everyone can rely on his redlists to scoop up stolen or ransom coins and return them to the victim? What is the point in paying for a hardware wallet in a world of redlists?
Is there an alternative solution to dealing with these problems which do not involve a taint list?