Even an experienced traders/investors will still get affected with the market condition it's all about how to control yourself in this kind of situation that's why they will be able to last long than those who haven't had any experience. What OP saying was true, it's all about the greed and fear you should maintain yourself in the middle or do something of what the market condition and try to take that as an advantage.
If there's a lot of fear means it's bearish and dropping then you wait and buy since it gets cheaper.
And also what you do during this situation, those that are becoming greedier for this season of a bearish trend. They're doing the right thing and they're greedy in terms of buying more because they know that the market will recover no matter what happens.
While those that only becomes greedy during the bull run, they'll just learn the lesson out of it that they'll be aware that they should take every moment to make profit when they can.
They put greed in a good situation and in the right place and buying is really a great opportunity at this bearish time. Fear is the feeling of a person who is not trusting Bitcoin and newbies but if we are here for many years and have experience in bear seasons, we actually can't feel about it. If I only have a lot of money, I also never lose this time to buy more.