Hahahaha! You would not blame them and I believe some of them who end up accepting their fate and HODL anyway, even though if it feels painful for them now after being a part of FOMO because they were dumb enough not to understand how market is, will eventually get to find it interesting and be happy they held eventually.
Nobody is dumb in this market especially as its such an unknown and new type sector type then it cannot be certain what exactly is the correct procedure. The only thing I can recommend is for people to stablise their entry and exits from positions, never buy all at once and hold or sell in an instant switch from crypto to fiat and expect to have perfect luck in timing.
Its better to buy a few times over time, preferably over a year. Part of the reason the market was so uneven is people jumping on the bandwagon all at once. Now we have sideways price action some equate it to weakness but thats only the case for speculators and traders who want to profit near term. Overall its far easier to deal with BTC now then it was this time last year when so uneven. There is speculation, so long as underlying development and requirement for BTC exists then the market is prospect should be reasonable to take part in