I've had several people tell me that pisses them off because it slanders what gold is.
The more the issue of taint rises, the more I agree with that perspective.
Taint... It's a really bad word for what is actually a "might possibly stem from, if we average everything". It's a fundamentally misapplied term for the way the bitcoin network works.
Take the simple example of a thief that steals 1 btc and makes a shared transaction with an innocent, with both of them transferring 1 btc (each) to one other output. The thief transfers 1 btc from one output to another, the innocent 1 btc from one (different) output to another. Because of the way bitcoin works, it's not possible to tell which amounts go where. However, the thief still has 100% of his ill-gotten gains and the innocent is still 100% innocent.
Taint has no place in bitcoin.