My question is, why the Chinese government banned Cryptocurrency but allows everything going?
For the same reason most of the laws in the U.S. exist: To keep everyone in a constant state of fear and submission. If you step out of line, there are probably a dozen felony charges that can be laid against you at any time.
Generally, yes, but the situation in China is quite clear for the moment. There was a month or so where officials' statements were unclear (possibly with intent, or they just hadn't decided yet), and mr Lee of BTCChina was extremely pessimistic.