We cannot blame people if they think this way because we all know there's no assurance on this kind of market. Personally, I have my fear in but since I believe on this technology I forget about it. Fear will make you feel weak but you have to overcome it and enjoy greater profit in the future.
Let us blame them for thinking that way because if they understand what they are getting into before getting into it at all, then they will not even bother about anything to the point of even thinking a crash could happen. Sure, none of us can make any solid prediction and we are not clairvoyants to know what is coming, but in the long run, we are just hoping and expectant that things would end up working right and it is always better to leave it that way.
I thought bitcoin has crashed, but it is funny when someone don't see 60% drop as a crash.
It is not funny if you see this way : The reasonable average price for bitcoin by end of 2017 may be $10k and anything beyond that prices must be "bubble". So, the downfall from $19,800 to current level was an expected one and we may not term it "crash".