I think its because of the support it is getting from people. You see no matter how to BTC fall people still trust their money on it because they know BTC will be back, in addition to that. You see BTC's high demand is also the one responsible for making it unstoppable.
That's true it's purely the trust of genuine and mature bitcoin users as they are aware that even if bitcoin going downward it's just temporary and on a longer run bitcoin is the best and the best part is you have control over your funds rather than any banks.