If the Chinese have 67% of the mining capacity why have they not acted on it, and why has no one else acted on it? Maybe because they don't? Hmmmm.
Chinese Mining Pools______________________________
AntPool 17.6%
BTC.com 3.9%
BTCC 8.9%
BW.com 10.9%
F2Pool 15%
HaoBTC 5.5%
ViaBTC 6.4%
_____________________________
Total 68.2% 
FYI:
http://www.btcpedia.com/bitcoin-51-attack/Bitcoin 51% Attack
Reverse transactions that he sends while hes in control.
This has the potential to double-spend transactions that previously had already been seen in the block chain.
Prevent some or all transactions from gaining any confirmations.
Prevent some or all other miners from mining any valid blocks.
FYI2:
There are 196 countries in the world today.
BTC is controlled by 1 country China.
BTC= BETTER TRUST CHINA