bitcoin volatile: no one is going to buy it because it is too volatile and only can be used for gambling, and serious players don't want to lose your money, and volatile is for gambling things, not for a currency. Bitcoin is only for get-rich-quick people and will die soon
bitcoin is stable: no one will buy it because they can't get rich quickly
There are many participants, each have different goal. Speculators who wanted to get rich quick always end up watching this sub forum

But there are also people using it for international remittance and long term saving purpose, the later is the main group that is absorbing the bitcoin sell pressure right now
Bitcoin is stable -> More and more people will use it as a tool to fight inflation and to send money overseas -> the demand will pass supply and cause the price to rally -> more speculators will join the rally and drive a large bubble -> bitcoin will become unstable
So the volatility will always be high