Well I believe Roger and Craig are fuckwits, so they could of contributed, but that was a big bubble so no doubt the bear market had a lot of contributors. Why do you rule the Chinese out as buyers though? I am not saying they are solely responsible and I know that the Chinese control the market is pure bullshit. But, that doesn't mean they can't contribute to these things.
The Chinese obviously have a lot of money and if you look at the worlds housing markets you can see that they are very keen to get their money out of China. Despite the capital controls they are still able to do this with ease I might add. So, why wouldn't they be trying to escape a devaluing currency? that's what I'm doing with Bitcoin.