My opinion for that is people wants something a less risky but they didn't know that the less risky it is, the less profits there is for them, as a human nature, it is natural to be scared, we have instinct to trust or not to trust sometimes, most likely, people wants fiat because it is "safe" for them (how ironic), but the truth is, there is no such thing as safe, dangers and risks are everywhere.
Majority of the hard working people look for safe investment rather than taking risk as they do not want to see their life earning to go to dust so there is a fine line in trading in high risk market and the safest option, you can see many people investing in bonds and majority will not even dare to invest in the stock market and you cannot any of those category to invest in a high volatile market like this. There are risk in every market but the less profit you get the lesser the risk and vice versa.
Many people want to get safety investment although with less reward or profit with their investment, only bitcoin and altcoin investors brave for take big risk to invest with bitcoin and altcoin. Maybe when we are talking with other investor think one more time for investing with bitcoin and altcoin because big risk with bitcoin price could be dump and they will disappointed when looking bitcoin and altcoin have higher price and get big result.