I guess it is inevitable for this kinds of news to appear or issues that would affect btc. There would always be some bad news regarding btc. China is the main miner in btc and it really affected the price but as i heard that it was temporary until the next election, i guess another price surge if the legislation would change there mine about the banning in China.
There will always be negative news like this that may come out and I'm pretty sure that there are more to come in the incoming years. China and J.P Morgan's statements had a big impact because they were both influential, thus the public simply reacted to it.
I'm not so sure as to the reason why China made such statements and I am also not that knowledgeable of the politics and nature of government in their country but from what I know, there are a lot of bitcoin users in that country. The recent events surely has affected them, and even for us who don't live in China.