I do not think that the problem is in the concept of centralization, but rather the preferred and well-known model for people is centralization. Banks arose more than 100 years ago, and almost all of us, since we were born, traded in cash, not gold, and even most of us believe that money is only in banks, given that cash payments have declined significantly Thus, the concept of decentralization is new to humans.
Humans are afraid of anything new, let alone responsibility in decentralization. For example:

 - You find that many people forget their bank account.
 - All responsibility in the bank is to prove your identity or signature, and the bank is responsible for securing your money from theft and all risks.
 - In Bitcoin you lose out if you lose access to the private key, most people don't want to take that responsibility.

If we take all these reasons, we will understand people's fear of cryptocurrencies.

I have not yet mentioned the influence of media, fake news, fraud, hacking, and others.