Believing in bitcoin will be necessary if people want to invest in bitcoin and not panic if the price is down like today because bitcoin is not weak as they thought and when the right time comes, bitcoin price will increase and will break the high price.
Anyone investing in Bitcoin should believe in the market and even if the price goes down there is no point in panicking because you should be confident that the market would reach those valuation at a later period of time and if you have the bank balance you should average your investment capital if the market goes down.
Since i have seen the market going down multiple times and in the past i was confident about the price recovering but this time around i am not too confident to invest during a correction until the market settles down as the price is really high. Expect more FUD news to come out in the coming days that might pull the market down.
Maybe people involved in bitcoin really trust bitcoin and do not doubt what bitcoin can in the future. But people who are new to bitcoin and lack knowledge about bitcoin will doubt it, especially if the price suddenly getting down deeper, like a few days ago. They can lose their belief in bitcoin and that is why they need to learn more details.
The market will recover at the right time and during this correction moment, we are given a good time to invest in many potential coins. But it needs more research to find a good time to enter the market because the situations are not unpredictable.