Market crash does not mean it won't recover, selling when the market is down is not a good idea, I hope by now you have realised that and gain enough experience to do things differently this time.
Always remember to invest what you can afford to lose and learn to have patience.
I completely agree with your opinion, I think many of us have gone through that moment, where we have no patience and we get desperate, especially when we were somewhat new to this world, or maybe we are glued to the chart all day, with nothing else matter, and this is not the case, in the investment and in the speculation of the market, normalcy and patience must always be present.
There are people who are just like you say, they sell when the price is falling, but they don't go short or with leverage, and this is a way to win, at least some market speculators do it, the only ones who don't what the investors do, because they have another way of looking at the market, but mostly the market gives to be able to make money at any time, but with the right movement.