The way some investors are behaving it is obvious that they don't still understand this you said and that is why we have people selling off when the market is going down because of wrong investment. The reason why some investors won't go forward or make progress in their investments is covetousness, some of them are not always contented with what they have even though that is the only thing they can afford at that point in time and anyone who wants to exceed there capability or capacity will definitely learn in the hard way because there is a saying that " you can not be faster than your shadow"
People are investing above their limits and this causes them to panic when the market is experiencing some discomfort. Investing isn't supposed to be fast so you can't be think about't investing today and be expecting to be cashing out tomorrow. I won't say people don't understand this but they're just too greedy to care, they want to make money so fast without giving it time to mature and it's not like when they get the money that they'll be able to manage it well to multiply it further instead they burn the whole money and go back to square one to start hustling again. Your Bitcoin accumulation pool shouldn't be extravagant that you go broke because you'll still get to sell your stash prematurely and that's the biggest problem of Bitcoin investors this days.
I usually have people come to me for help on how to make some money online, this first thing I usually tell them is that, if they're looking for a way to make quick profits online, then I don't have it, but if they're seeking for a way to gradually build wealth overtime, then I'd be happy to help them. Nigerian economy is messed up and everyone is looking for an escape route from the hardship and that's why majority of the people who go into the market are mostly very interested in taking quick profits, not like I blame them them for that, but it'll only result to unnecessary panic and pressure just as you've rightly stated, whenever the market declined, they feel they're losing their money, and even when the market is in an upward trend, and theyre making some pretty cool profits, they'd also feel like taking their profits and this only means they lack that long term outlook and also missing the big picture while chasing small profits.