We've been here before, you are just making the whales richer, selling your precious BTC for pennies (crappy fiat). The storm will pass, hodl, or try to accumulate even more BTC, it's a great time to buy for cheap. We will make it this time too. Even if BTC goes down to $15,000 nothing is forever. Remember $20,000 down to $3,000? Been through that storm too. Remember, 1 BTC = 1 BTC. To the Moon!
This is the general rule but in reality, it is easier said than done.
Some of the investors who put their investments into BTC at least invested hundreds to thousands of dollars. This implies that the slightest movement in its price could mean a profit/loss on their part. But if an investor would put that amount of capital, they must have a contingent plan and a goal on their investments.
But in all honesty, I agree with you- BTCs are inflationary in nature. They are too precious to be sold especially that its price are relatively low in the market.
I hear what you are saying and agree with you too but I would have believed that any investors that want to invest some huge amount in Bitcoin should understand how the market operates and like you said, we have seen the most recent 2017's $20k price down to $3k+ and back to a new ATH of $69k but the problem is as I must have mentioned before, most are not investors but traders and they react quickly to almost every price change cos a real investor would know better not to sell during bears but try to accumulate more.