Not bashing anyone, but this is worse than gambling, because families lose out when you cash in, not a casino. Every extra piece of pie is on that came off someone elses plate.
The only reason why somebody should lose money/value is if he/she pays too much for a bitcoin. and why should anybody sell it to them for less than it's worth? or even a fair price? if they pay too much, they have just given their money away, and it's nobodies fault but their own. If they then panic sell when they see the price fall, that is their fault too.
gambling at a casino is much worse, because everyone loses eventually at a casino, and they cant feed themselves either. bitcoiners have made a net profit because they have provided a service of liquidity and capital support to a very innovative technology.