They are afraid to invest when Bitcoin is near its bottom. As Bitcoin is now down about 70%, there is no point in fearing because from here there are high chances of going up and the chances of dropping are slim.
There is no better time to make a long-term investment in bitcoin than now IMO.
However, sadly, when bitcoin is at $69k, some people claim that bitcoin is too high and that they are unable to purchase it, so they wait for bitcoin to fall before making an investment. Nevertheless, when bitcoin drops below 20k, they begin to panic and believe that bitcoin will continue to fall and many say that bitcoin will go to zero. They are afraid to invest in bitcoin because they have no faith in it, they think it might die or will go to zero, and they are afraid of its volatility. In spite of the fact that we view bitcoin volatility as a potential profit opportunity.