Although, no investors is happy when his investment is declining instead of appreciating but a good investor that have good understanding of the volatility nature of Bitcoin will not be under pressure when Bitcoin is in dip because the rate at which Bitcoin appreciate is much more than the the decline. And this is the reason why planing for long term investment is one of the unique quality of a good investor because if you hold a starch of Bitcoin for long term you will surely recover all the lost incur during the dip and still maximum your profit in the future.
Irrespective of any circumstances a good investor is always patience and perseverance and will always tend to sustain his investment for long term.
Exactly no one would be happy about a decline in their efforts when they must have put up so much to make it work, tho every investors should understand that there are times the market will be favourable and there are times it would be tormenting, so at every stage they shouldn't panic or be in pressure of wanting to sell out, but alot of investors don't actually have such patience of waiting so they go on with selling. Patience it's actually a vital key when involved in things that are associated with money and if you think it doesn't worth the wait then don't go into it.