indeed there is an overgrowing fear especially on Bitcoin like for example the double spent move but for me the biggest fear is from the so called cryptocurrency regulations. 
It is hard to keep up with the speed of regulation change, and also with the number of ICOs
Definitely both issues, though personally I'd focus more on distilling the bad (and the really bad) from the good, since a. regulations aren't necessarily predictable or within our control, and b. there's so much out there, and so much of it is horrendous.