Most probably those people are investors who do the long term goal. They do not care how low would the value of bitcoin decrease because they are aiming for the long term and they knew that the decrease would be temporary and it will recover in the coming years.
There are really investors here who put a lot of money in bitcoin for the long haul. Those investors care for the value of bitcoin, but they are not scared if the price of bitcoin goes down. They don't panic. And they understand that it is part of the system. Bitcoin will not be bullish everytime and even it would decrease they still hold and hope that bitcoin can recover and will go further than the previous price. That is their mindset. Their investment is like 1 or more years in bitcoin.